upto 2gig at moment, but thats only due to phase release , the standard actualy goes up to 32 gigs, , and ive heard that the k800 comes with 4 gig cards with handset.
i think its only a matter of time before we see 4 gig sticks on the market from both pro and sandisk, i think sandisk is a slower chip than the pro meaning you can read/write at faster usb 2.0 spec's with the pro