[fitzbg]

Personally, I have a "SanDisk 8GB microSDHC w/ MobileMate micro Reader" bought from Buy.com.
I have always used it on my Vogue regardless of the ROM (currently on DHarveys 6.1 Black Vista) and still good and dandy.
I have tons of pix and music, a few large videos (over 500MB) and many applications running of the card, including storage for email attachments. I listen to my music every day on my way to work on the metro and back. I use Windows Player, GSPlayer, CorePlayer. No problems.
The only one time I had a problem with this card, was not on the phone though. I was using the reader on my laptop to rip a DVD directly to the card, and it didn't like it. I contacted SanDisk support (totally useless and ridiculous) and they referred me to the RescuePro thieves... yeah, they want to sell you a half-*** product to profit on your problems... I said no way, i formatted the card and never looked back.
I am sorry I am not giving you answers. But at least, I hope this post helps to determine what should NOT be an issue with your card.
And if you still have the issues, stick to your PIM backups and hopes.