Don’t ask me what was cooking at Microsoft’s when they decided to make the MicroSD cards unexchangeable – if there is one thing which will probably fall in the near future, then it is this stupid rule.
Dell Venue Pro: slot hidden beneath sticky tape
Officially, the Dell Venue Pro has no MicroSD slot. However, one was found at Yfrog – it is below a “warranty void” sticker:

Samsung Focus: don’t use the slot
WindowsPhoneSecrets reports the following:
AT&T is now telling its employees not to install microSD cards in Samsung Focus phones until that fix is available, and it is advising customers not to upgrade the phones themselves.
Related posts:
Well i got the samsung focus and no one at att told me about this problems so i got the focus and a microSd and when i went to return it they want a $35.00 return fee you believe this shit.
i call 611 on my cell and no one there can tell me about so call the att note that was sent out to there staff.
Hi Angel,
I am not sure enough of the US legal system if the lack of MicroSD support permits you to give them the finger. In Austria, it probably would.
It now depends: do you want to use the MicroSD for data exchange or only for a onetime memory expansion?
All the best
Tam