I only wonder why websites who use it themselves, break other shebang urls when you post them - try sharing a twitter url on facebook (always have to strip the #!/ manually).
We started using Google's ajax crawling spec. Whenever we see:
http://twitter.com/#!/ptarjan
we actually crawl http://twitter.com/?_escaped_fragment_=/ptarjan
Let me know if you notice any issues.//edit: btw, do you work with the new messages? I got an annoying bug there - as you type, often the cursor jumps to the end. annoying as hell when you edit sth in the middle of the sentence.