For those with S3's, Fuji has announced a camera buffer upgrade that supposedly speeds things up and with the additional memory allows you to buffer more images while writing them to the card memory.
Also there are a number of upgrades to the PC and MAC software, including drivers for WIN 98. This is available on the Fuji site. Fuji site
If you haven't discovered S2 Pro site
there is also a software upgrade there for free and you can get the FREE Thom Hogan S2 book... I think. I got mine a long time ago, the offer is still there though.
A friend told me his S2 died of the CCD problem. I haven't checked my serial number yet, thus optimistically stalling off the possibility I may also be affected eventually.