+1 on 7-zip.
I used to have an older version of WinZip that came with the pc when I bought it. I decided to upgrade to WinZip 11 after I ran into a problem working with files I had tarred and then gzipped in Unix. The nag screens in v11 were a major pain so I went to 7-Zip after looking for some alternatives. I have been using 7-zip for a couple of months now and it works very well for me. Best of all, its open source software. You don’t have to pay if you don’t want to. (Though I like it so much I am thinking of sending them a 20)
