right now www.yousendit.com allows you to upload a file which can be downloaded like 25 times, after that u have to upload it again..

one more nice free service is www.ezshare.de

when u upload your file, u'll get .html address.. you post this address on board or in mail, then anyone interested in your file comes on it and waits for 30 seconds until link to mp3, zip or whatever format u uploaded, is revealed..

good thing is it doesnt seem to have download limits like yousendit