EverythingRE - Has Real Estate software solutions for your Palm PDA including calculator and tracking systems. 

AptHand.com -  Has Home Buying for Digerati for Palm OS PDAs. It allows you to track real estate listings, calculate your own monthly mortgage costs and become an informed buyer.

Palm-Tech - Home inspection software designed for use with HP Jornada's. It allows immediate, on-site printing of home inspection reports.

Pocket-MLS.com - Has a software package that lets real estate agents access the MLS (Multiple Listing Service) from a Palm Treo, Blackberry or Windows Mobile smartphone.

PocketRealEstate.com - Has a software application for the Palm OS or Pocket PCs that provides access to the MLS.

WayPoint Pocket Real Estate - Integrates your MLS data with GPS technology for navigating your way between listings.

PDARE.com - Has news, reviews, columns, tutorials and more for PDA users in the real estate profession.