Miel Van Opstal (http://micromiel.com/) recently shared internally a list of nice Windows Mobile apps he saw demoed. There's some really cool stuff thout there!
http://www.jeyo.com/companion.asp *** update to the popular Outlook-style Windows Mobile device manager that allows you to manage and customize your Window Mobile device from your Windows PC. Its powerful threaded SMS chat mode enables you to communicate instantly with hundreds of millions of mobile phone users around the world using SMS directly from your PC, and manage all the important personal data on your Smartphone or Pocket PC phone
http://www.imagination.at/en/?Products:Mobile_Applications super cool applications for mobile, integrated with your daily life
http://www.cellfire.com/ next generation of shopping: Mobile coupons
https://m.mesh.com Live Mesh, mobile client
http://m.wmwifirouter.com/ -- WMWifiRouter instantly turns your wifi enabled smartphone* into a wireless internet hotspot. Now you can use your laptop and any other device with wifi to get online and surf, email, instant message, and anything else you normally use the internet for!