iTunes Library Updater
Great for cleaning up orphaned files and such.
Use your gmail account as an online storage space – nice interface.
Autosniping for your ebay auctions – now you don’t have to stay up or time your last second bids – let phantombidder do it for you. Only $0.50 per successful bid (no charge if your max is not enough to win)
For sending yourself big files that might be too big for email. Think of it as your own ftp server. Free.
For many more tips like this, check out the Yak Shaving Razor Archive