Ambientweet 1.0.1 is on it’s way, and has been submitted to the Mac App store today for review.
It brings with it a slew of syncing/caching updates which should result in more reliable fetching of tweets (especially after it’s been running for a while), and a faster startup.
The posting interface has also been improved - it looks more like a normal tweet window now, and it correctly deals with long urls, allowing you to post tweets that appear to be longer than 140 character, but which will be under the limit after Twitter has shortened the links.