The very popular TweetCaster Twitter client has just posted to the Windows Phone 7 Marketplace.  This is a Pro version which costs $4.99 and has no trial version so make sure you’re ready to use this because there is no turning back from the purchase.

Here is the developers description of the app:

It is lightning fast and loaded with more features than any other Twitter app in a clean, attractive user interface that users love.

Features all the essential Twitter functions like reading your timeline, viewing profiles, and sending Tweets, plus so much more!

Want to simultaneously post to Facebook and Twitter? It’s there! Want to manage more than one Twitter Account? No problem!

Here is the list of key TweetCaster features:

Multiple Account Support
Facebook Integration
Timeline Search
Advanced Profile Editing
Multiple Themes
Follower Management
Long tweet Support
Draft Manager
Twitter Trends
Threaded Conversations
Standard features such as Search, URL shortening, Photo/Video Uploading, Retweeets (with or without comment)

Sounds like a very feature complete Twitter client and their popularity is well proven based on their iPhone and Android versions of the app.

The app is developed by Handmark – the company who has developed lots of mobile applications and is one of the longest existing mobile app distributors that I know of.  I can remember downloading stuff from them in the early Pocket PC days.

See more about the app at wp7applist –