If you prefer, you can use any RSS compatible plugin, such as Feedlist for Wordpress to display the Twitter RSS feed.
There is also a Twitter for Wordpress plugin. I haven't tried it since it seems like the cut and paste code is so simple to implement, but it's another option available.
If you encounter the "Tweet My Blog" plugin in your search for Twitter integration, avoid it. There is word that it is adware. Not great for SEO.
In other Wordpress news, Wordpress version 2.6.1 has been released. This is a bugfix release without much in the way features. If you or your users have experienced any of the problems mentioned, install it as soon as possible