Three that I've used in the past were Whalemail, Gigasize and SendSpace. In my personal opinion SendSpace seemed to work the best for me and even though SendSpace required you to register, it's a free service if you stayed under 300 MB.
"Just post some random unrelated text. We have members here who can help you with that." ~ Chacal "When all else fails, read the instructions... if that doesn't work either, try following them." ~ Old Prof