What with relocating to LA, I've been lagging on blog posts recently. I discovered a couple things that I haven't yet had time to fully investigate, but they're both interesting.
The first is Magma, an open-source object-oriented database. I got a great e-mail about object-oriented DBs from Thierry Thelliez which I'm hoping to post/summarize here; although you don't hear about people using them much in "real life" they do in fact appear to have pretty significant advantages. Chris Muller, Magma's creator, did a podcast interview on OODBs in general and Magma in particular, and apparently Magma is very "ready for prime time."
The second recent discovery is Traits, a new feature in Squeak 3.9 which is kind of like Ruby mixins, but with a cleaner inheritance mechanism (if I understand correctly). I haven't been able to play with these yet, but if you google "Squeak Traits" you'll find all kinds of interesting stuff, including something in the AspectJ community. Apparently the idea's proven very popular.