In keeping with the title of this thread, the paid apps (and some free) that I use that have been updated to work with the 700p:
2Day, today-type home screen, giving status on calendar, calls, tasks, email, notifications on missed events, with plugins for other apps (QuickNews, weather using 4cast)
4cast, weather monitoring using Yahoo weather, can be viewed via plugin in 2Day, DateBk or ZLauncher
Agendus Mail, Iambic's mail app, (though I've stopped using it)
Agendus Premier, excellent PIM manager (i.e. contacts, calendar)
BackupMan, a device-based backup app (though I've stopped using it)
Butler, alarms, LED control, attention-getter (nagging)
ChatterEmail (email app, does pop3 and IMAP, the latter very well, very well supported)
Directory Assistant (freeware), phone book-type lookup, directions, maps
FlightStatus (freeware), just that...arrival/departure/in-flight info in real time
Google Maps (freeware), excellent mapping/driving direction/look-up app
LightwavPro, ringtone manager, full-screen caller ID, call-blocking
mobileClock, alarms, stopwatch
NoahPro (freeware), excellent dictionary with 2 size databases to choose from
palmPDF (freeware), allows viewing of .pdf files (IMO, better than DTG)
PDANet, allows you to use your 700p to get online with your computer
pocketTunes Deluxe, the top-of-the-line version of the standard app
RescoBackup, a backup app, allowing scheduled backups, full/selective
restores, also restores java files
UninstallManager, an app that monitors newly-installed apps, grouping all files associated with/created by that app, and deletes them all if you decide to get rid of that particular ap
volumeCare, boosts headset, speaker, handset volume (Deluxe also does
ringtones, apps)
ZLauncher, excellent, customizable launcher, with an excellent file manager
(I also use Diddlebug, HandyShopper, Splash ID & Money and TCPMP but the versions that were used on the 650 have been stable on my 700p)
EDIT: I've made a couple changes to my apps since originally posting this and I've captured most of them in my post. I've also added descriptions and links which might make it a little easier for new members.
EDIT: I no longer use HandyShopper, as Agendus now allows "notes" (lists that you can check as you complete) to be added to tasks