Vegas update: Carmen Sandiego is On the Run! by Don Bailey & Nick DePetrillo. They seem to have updated their talk for Black Hat. Very interesting for me but not related to mobile phones: How to Hack Millions of Routers by Craig Heffner. He is talking at both Black Hat and Defcon. So far only one mobile talk at Defcon: This is not the droid you're looking for... by Nicholas J. Percoco and Christian Papathanasiou.
SyScan Singapore has one talk on GSM security by the Grugq (the same one he will give in Vegas).
I'm still looking for a new Android device. The device closest to my needs is a Motorola Milestone (I want a keyboard). But I really don't want to buy a device with a closed bootloader. For sometime I considered a Nexus One even without a keyboard, but the price is a little to high in my opinion.