A detailed history of changes is maintained on
https://code.edge.launchpad.net/planet-drupal/ .
It's in bzr format, more complete and easier to browse than venerable CVS.

Here are the individual bzr commit messages, in reverse chronologic order:


---------------------------------------- [2009-03-23T04:13:31-swe3tdave]
Fixing drupal.org issue #402414 using patch proposed by poseurtech
Fixed missing return before calling planet__update
Fixed planet__build_admin_feeds_table: the admin section is supposed to let you administer everyone not just the admin.. ;P

---------------------------------------- [2009-03-22T15:08:26-swe3tdave]
Merging last changes from m-baert's branch rev. 20

---------------------------------------- [2009-03-21T16:38:04-swe3tdave]
Added change from m-baert's branch revision 19

---------------------------------------- [2009-03-21T04:25:18-swe3tdave]
Simplifying planet_user_feeds() and _planet_settings() functions.
Created planet__update() function.
Created planet__submit_feed_data() function.

---------------------------------------- [2009-03-21T01:41:56-swe3tdave]
humm.. a commit for a comma, :P

---------------------------------------- [2009-03-21T01:30:45-swe3tdave]
Merging changes from another branch(m-baert up to rev.16)

---------------------------------------- [2009-03-20T19:22:38-swe3tdave]
Fixed planet__add_feed function

---------------------------------------- [2009-03-20T18:05:08-swe3tdave]
Fixing bugs from the last merge...

---------------------------------------- [2009-03-20T17:28:28-swe3tdave]
Merging lp:~m-baert/drupal-planet/6.x Rev.13 back to this branch.

---------------------------------------- [2009-03-20T15:58:48-swe3tdave]
Merging lp:~m-baert/drupal-planet/6.x Rev.11 back to this branch.

---------------------------------------- [2009-03-20T04:37:38-swe3tdave]
Updating README.txt

---------------------------------------- [2009-03-19T17:45:56-swe3tdave]
Fixing Documentation... :P

---------------------------------------- [2009-03-19T15:53:33-swe3tdave]
This should fix the problems when updating from rev. 9.

---------------------------------------- [2009-03-19T14:47:33-swe3tdave]
Fixing Anonymous nodes & Missing title when adding a feed.

---------------------------------------- [2009-03-17T15:38:26-swe3tdave]
Fixed empty nid in planet_items

---------------------------------------- [2009-03-17T03:26:31-swe3tdave]
Switching xml parsing to the SimplePie library.

---------------------------------------- [2009-03-08T19:00:05-swe3tdave]
Adding xml feed link.

---------------------------------------- [2009-03-08T18:51:26-swe3tdave]
Fixing 'planet/feed'.

---------------------------------------- [2009-03-08T03:14:07-swe3tdave]
Also added an automatic refresh when an admin add a feed

TODO: SubFunctions to simplify planet_user_feeds() and _planet_settings().

---------------------------------------- [2009-03-04T16:23:51-michael]
Changing some spelling/words

---------------------------------------- [2009-03-03T18:55:42-swe3tdave]
Added an automatic refresh when a user add a feed, removing the need to wait for the next cron.
Removed Refresh and Freeze for users since they dont have the permissions.
When modifying a feed, if the user is not in the selected author role, it will be added to the authors options.

---------------------------------------- [2009-03-01T04:39:23-swe3tdave]
Corrected permission problem

---------------------------------------- [2009-03-01T03:00:14-swe3tdave]
My latest changes as of Feb. 28, 2009.

TODO: need a way to selectively hide a feed item.

BUG: user refresh is not working

NEW FEATURE: My Account->Planet Feeds
NEW FEATURE: You can select the filter format in planet settings.
NEW FEATURE: When you delete a feed, all the items and nodes that where comming from that feed are also deleted.. (TODO: i should make this an option...)
NEW FEATURE: Planet menu going to Planet Page.

---------------------------------------- [2009-03-01T02:54:23-swe3tdave]
Initial port to 6.x by sivaji (http://drupal.org/user/328724)

---------------------------------------- [2009-03-01T02:52:51-swe3tdave]
initial upload of planet-5.x-1.2.tar.gz


========================================================================

Here are the old registered cvs commit messages, in reverse chronologic order:


---------------------------------------- [2009-03-12 00:15:34 +0100-swe3tdave]
#359177 by sivaji, swe3tdave: Porting to Drupal 6

---------------------------------------- [2007-06-19 00:53:54 +0200-dww]
#152819: Module .info files should not define 'version' in CVS

---------------------------------------- [2007-06-15 19:28:29 +0200-daryl]
updating planet.module to allow node/$nid urls to redirect to actual link; also includes admin form to toggle this option

---------------------------------------- [2007-05-30 05:22:01 +0200-daryl]
updates including fix for inability to edit feed and failure to create planet items because of empty auto_publish string

---------------------------------------- [2007-05-10 22:27:41 +0200-daryl]
checking in files for drupal 5.1

---------------------------------------- [2006-08-25 23:32:17 +0200-daryl]
fixing node_info hook

---------------------------------------- [2006-08-25 22:17:17 +0200-daryl]
closing ul tag

---------------------------------------- [2006-08-25 22:15:01 +0200-daryl]
Adding aggregator2 credit

---------------------------------------- [2006-08-25 22:11:43 +0200-daryl]
adding planet module