A few of the app / utilities I would love to see in the repos once the n900 launches...

• Ability to sync Google Contact and Calendar with the native applications.
  
• Ability to create folders within the Applications folder (e.g Games)
  
• Notifications client for social networks (Facebook / Twitter / Flickr / Linkedin etc), something which will notify me that there has been activity on my account and launch browser taking me to the service (More than just an RSS reader...)
  
• Easy way of sharing content via WiFi. Run a web server on the device which can dynamically expose Contacts, Calendar, Media via a Webpages (PHP etc).
  
• Ability to use device as a WiFi Modem. (e.g. MiFi)
  
• Password support for Alphanumeric passwords