Jakub Zalas gave a talk at PHP London last night about Symfony components.
Not something I knew much about so interesting to hear about. YAML component sounds good and Event Dispatcher component seemed like it might be useful too. They also have a Finder that allows you to find files and directories. I’m not sure what I’d use it for (but i’m sure it would come in useful somewhere).
You can use the components independently of the framework. Jakub said the community is very good and the documentation is being expanded quite fast, what I’ve seen looks quite good.

Oh and the components have nice logo pictures so that is me won over. I’ll add them to my list of technologies to poke.

Perhaps the next thing I build will be in Symfony or involving it any way.