Windows Live SkyDrive - 5 Gb of free storage
Windows Live SkyDrive 5 Gb of free storage. I could've used this a few weeks ago for a client to send me some 5 and 10 Mb zipped files. I'm sure there are other services like this but in the above example I just had the client email me the zipped files so that worked.
Mind you, being the paranoid type, I'd put a passphrase on zipped files I was going to place on there.
You can make files available to specific folks on your Instant Messenger (or whatever it's called now) or key in an email address.