Just thought the list was interesting. Ranking based upon log ins to TrackerDog site:

Rank - % of peeps using - Program Name - Current Version - Last Updated

100.0% TrackerDog 2.30 2005-07-03
2 71.1% Documents To Go Premium Edition 8.001 2005-11-15
3 63.2% FileZ 6.8.3 2005-07-10
4 52.3% eReader 2.6.1 2005-04-12
5 41.2% Uninstall Manager 3.03 2005-12-12
6 39.7% Pocket Tunes 3.1.3 2006-01-05
7 37.3% VersaMail 2.7 2004-02-06
8 35.1% AvantGo for Palm OS 5 5.7 2004-12-16
9 33.6% Acrobat Reader for Palm OS 3.0 2003-06-18
10 33.3% MetrO 5.3.8 2006-01-18
11 33.3% Icon Manager 1.6b 2004-11-07
12 33.0% Cleanup 3.44 2005-11-27
13 31.7% Crash Pro 2.22 2006-01-05
14 31.5% SplashID 3.32 2005-07-13
15 30.5% BackupBuddyVFS Professional 3.2.11 2005-11-23
16 28.7% HandyShopper - English 2.9c 2005-07-16
17 28.2% ZLauncher 5.32 2005-11-07
18 26.1% Agendus for Palm OS Standard Edi 10.04 2005-10-18
19 25.4% PalmVMFontLibrary 1.0 2005-08-19
20 24.8% Softick Card Export II 2.22 2005-11-08

List is tabulated by web based sync to TD site where TD compares version of apps on Palm device with its own database. One on hand, it's actual usage not "votes" so that is good, OTOH, if you ain't using TD, it ain't tracking usage. Note, if you are using older version it still counts you as a user.