Eclipse Helios is a release, but it's also a complete development cycle in a global and distributed team of commiters. Since I choose 3 features I especially liked in Helios this kept bugging me : what is Helios to me ?
Helios will have its place in my memory, not the bits themselves but good things we had as a community.
1 - The Acceleo Community joins Eclipse.org and starts by using black magic to build bits
2 - Eclipse Summit Europe is the best Eclipse conference to meet friends
3- The dreaded diamonds of the Simultaneous Release are still haunting my dreams...
4- Our friend Hudson is now serving way more projects, but not always happily.
5 - The Foundation keeps moving things forward
Last but not least, this Helios cycle was filled with more interactions with end-users and adopters leading to nice enhancements in Eclipse as a whole, thanks for your help !