I second your enthusiasm for this site, jamexcel.

About app compatibility, I generally stick to the apps discussed in this forum and ones listed at maemo.org and garage.maemo.org sites, because i don't know enough about linux to make things work with maemo. however, i think you can emulate PalmOS using garnet vm. check this thread for more PIM apps:
http://www.internettablettalk.com/fo...ad.php?t=17142

AND you can always post a request here for someone to try porting something new if it's open-source. chances are, someone will at least be able to point you in the direction of a similar app being worked on (and possibly already ported) for maemo.