http://s2.yousendit.com/

probably the best online tool for sharing around at the moment

allows you to share files of up to ONE GIG in size

basically, upload the file, and email the link to yourself, then post that link on the board

i think it lasts for 2 months or something (not 100% sure on that, have my own paid for webspace so dont use this too much) from the date of the last download

fantastic piece of kit for uploading anything from tunes to mixes for sharing