I am currently running on the storage card (4 GB):
Resco File Explorer
Adobe
Hubdog 2.0
iNav
Skype
TCMP
Wififofum
Windows Live Mobile

No issues with these as these applications - so far- I think they tend to not write to the card that much.

I am running Hubdog without downloading enclosures. I have switched over to streaming the podcasts with Hubdog (through TCMP). I listened to a 35 minute one this morning on the way to work with no issues or even hickups. BTW I am in a EVDO area with the Sprint version. Nice thing about streaming as I no longer have over 1gb of podcasts at anyone time on my storage card. - nor do I have to worry about making sure I sync Hubdog with wifi before I leave home. - More room for Music and Video (currently it is 3.4 gb full).