just the one, an old 30gb ipod. it's miserably small compared to the size of my music collection. i almost got a new 160gb while visiting the US last month, but for some reason i opted for a new digital camera instead.
of course, it is quite a big step up from my very first mp3 player - a Diamond Rio PMP300. 32mb of storage, and it cost a whopping $200 back in 1998. it had this huge adapter that plugged into a parallel port, then the cable for the player plugged into that. it took forever to transfer music, even though it only held like 12 songs (128 kbps was the norm back then)
Rio PMP300 - Wikipedia, the free encyclopedia