If you're addicted to Twitter and can't stand not having access to what your pals are doing then install ceTwit onto your mobile.
This free Twitter client for Windows Mobile lets you send and receive tweets from your Pocket PC. In order to start using the program you simply need to install the .cab file then register your Twitter account details into the system via the 'Account/Net' option within the ceTwit settings menu.
Once you've set it up, ceTwit will pull all of the latest updates you've received from friends and display them within the client. You can set the program to 'Auto Refresh' to make sure you're always up-to-date with what everyone is doing. ceTwit has a full range of options for dealing with incoming tweets, available by choosing the 'Action' option while a message is highlighted. From here you can reply, send a direct message, open a link, favorite, follow/unfollow the poster, and much more.
Of course, ceTwit also lets you post your own Tweets, which it does very simply. You just click on the 'Status' button and choose whether to post using Twitter, TwitPic, or Ping.fm.
What I really love about ceTwit is that, unlike many mobile Twitter clients, it doesn't skimp on features and functionality. There are a huge range of options and settings for you to customize your Twitter experience to the max. For instance, you can choose to view your last communications, set a rate limi, and even alter the appearance of the interface by applying and editing themes.
On the downside, accessing all these options is a bit cumbersome because all of the settings are buried within context menus, rather than being clearly available through the ceTwit client interface itself.
That said, ceTwit offers one of the most effective ways to manage Twitter when you're on the move.