Hold on...a .zip file? Are you sure the file size is the problem? I don't see how you meant to upload a .zip file to a thread on ZD? Unless you mean that you wanted to upload it so that you could link to it in the thread. Is this what you mean?
For upload sites, there's
Mediafire which is my personal favorite.
You could also try
Megaupload or
Rapidshare, to name a few (there are many more) but honestly, Mediafire is my favorite. There's no wait, no security codes, and it's just easier.