SHAREWARE.COM
http://www.shareware.com/
Macdownload.com
http://www.zdnet.com/mac/download.html
JUMBO!
http://www.jumbo.com/
PC
Magazine Downloads
http://www8.zdnet.com/pcmag/downloads/
M&M Software:
Educational Shareware
http://www.mm-soft.com/
Pass the Shareware
http://www.passtheshareware.com/
File Mine
http://www.filemine.com/