I am not sure how long it will last, but I have a new favorite thing:
Stateful session EJBs (SFSBs)
I have been working with some fairly massive (and complex) data structures that I have been reloading from my database every time I needed to do a query or modification. And now, it looks like I may be able to stop doing this!
There will be some fairly radical changes necessary to really take advantage of SFSBs - but I am expecting the speed improvements to more than justify the work.
Yay! I like new toys.