[eluser]Josh Giese[/eluser]
The problem is with twitter, not with simple pie.
I have outlined the problem here in my blog: <a href="http://joshhighland.com/blog/2008/04/19/lifestreaming-is-simple-as-pie/">http://joshhighland.com/blog/2008/04/19/lifestreaming-is-simple-as-pie/</a>
You can fix the problem by commenting out a few lines in the simplepie class that just do some error checking.
I hope this helps you out.