Speaking of WinZip, I'd been searching a long time for a replacement for it, seeing as how I didn't want to either spend $30 on it or use it unlicensed, and I finally found UltimateZip about six months ago. Not only is it a suitable free replacement, but I actually like it better. For one (silly) thing, when you use the context menu's extract to feature, it doesn't bring up the entire application, but just shows a progress dialog. There are a few other things that I also like better about it, but I think everyone should definitely check it out.

Edit: I just found out that the new version is all ad-ware-y, so nevermind, unless you can find a beta version somewhere.