i have spent the last month or so on a game, and my friends want to play it. Where is a good place to host it?

You have a ton of options. If it's less than 200MB, I'd suggest opening a free mediafire.com account and uploading it there. If it's larger, check out these other hosting services. If it's relatively small, you could probably just email it or share via Skype.

And if it's larger, you can always use a zipping tool, compressing your game, and separating the zipped archive in part files of a given size (if you ever seen files like "abc.rar.part1", "abc.rar.part2", etc).

Also, there are a lot of hosting services (apart from mediafire), like GameCreator said, like RapidShare, DepositFiles, FileFactory, etc.

Note that some of these may only allow for storing only (you, the user with the account, can upload and download your files, but someone else cannot).