I have a mac and have had my TP since November. Just connect it via disk drive like someone said above (start/settings/USB to PC) and make sure you select disk drive and share away.
If you are thinking of unlocking your TP you should go
here, as you can unlock it now via the storage card! Unlocking, if you don't already know, can open the PPC world up to you like no other! After you unlock you can flash new roms, which is just a fancy way of saying that you can try other peoples versions of the operating system (tweaked and very fast!)