With the introduction of OAuth as Twitters only available login method many programs and scripts broke.
Most noteably Peep on any HTC phone refused to update and now the handy Lifestream plugin for WordPress will not fetch my Twitter updates.
The first issue was fixed by HTC after a few days.
The second issue I’ve resolved with a work around. Rather than linking Lifestream to my account I have it reading the following RSS feed which includes my Tweets: http://search.twitter.com/search.atom?q=from:llygoden the key to the feed is the from:llygoden part where llygoden is my username. Having it parse this feed gives me back Tweets in my Lifestream.