Just yesterday, I attended devcamp at Bangalore ThoughtWorks . It was first of the kind for me (I have not attended the bar camps before) and the experience was new. The camp followed the true spirit of unconference and I was immediately hooked to it. Jumping out of talks in between to check out others was something I did all the time. Another thing I learned about unconferences was that you go there to get a flavor of different stuff and may be contribute some very specific or very generic stuff. Details have no place there (at least that has been my first impression).
Some themes which I found interesting were Ruby and RoR, Semantic Web (which I could not attend much even going by my camp standards), Mashups and RIA frameworks. There were standalone sessions on Eclipse Plug-in Development, Android (missed that one) and others. There was one 'any language any website' session which was interesting. Another real good session on 'Product design and development' - really got to know some good concepts. The lightning talks were quite good - the shortness helps mitigating boredom and fostering breadth.
I will probably post later on specific topics I attended here.
Hearing Martin talk was another wish come true.
Overall had a good time and a great experience.