Twipler is an Open Source Twitter web client written in ASP.NET.

The aims of the project are

create a Twitter Web client make the client themeable and customisable with complete CSS/HTML control provide additional functionality (mutual followers, block by rule etc) filter and organise incomming tweets

More information : http://blog.twipler.com Or try the application: http://app.twipler.com

--- Example

#!include PageHeader!#
#!doc name="tweets" select="Status.OnFriendsTimeline()"!#
#!select name="tweets" select="/"!#
#!docval name="tweets" field="screen_name!# said #!docval name="tweets" field="text!#
#!selectend!#
#!docend!#
#!include PageFooter!#