Twikini released 1.0 recently and before I could post on it, 1.1 has been released. The svelte Twitter app for Windows Mobile phones now supports Direct Messages, multiple accounts, the ability to view the public timeline, faster refreshes and a quicker startup time. And for those that were using 1.0, the Exit menu item has been returned in 1.1
Twikini works on all Windows Mobile devices version 5 and higher. The prices can be found here, which range from free to $9.95 depending on usage.