Microsoft.com Pocket PC Downloads - Has add-ons, updates, and downloads for Windows Mobile powered Pocket PCs.

ZDNet Pocket PC Downloads - Has many categories to choose from including software for other systems.

Open Source PPC - Has Open Source software for Pocket PCs in many categories.

Download.com Pocket PC page - Has new releases, most popular, and top picks for  Pocket PC / Windows Mobile software.

Freeware PPC - Has listings of freeware for Pocket PC users.

HPC.net - Lists the latest Windows Mobile powered Pocket PC software.

Handango Pocket PC - Many different titles of Windows Mobile / Pocket PC titles to choose from.

PocketPCsoft.net - This site has free Pocket PC / Windows Mobile software to download, including medical, bible, games and freeware.