Woohoo, indeed, for many reasons.
One of which is that I have finally finished my paper, which has been reviewed by my pass as suitable for submission for publication. I just need the ok from zebigboss and it's off to the publisher. If it gets accepted (which it should, touch wood), that'll mean that I'll have been published twice in the last 6 months: once as a 1st author, once as a 2nd. This pleases me to no end.
Another reason that I'm happy is that I've released a new version of my pet project, the Ontology Lookup Service live to the world, with tons of cool new bells and whistles. Try it! Go on, you know you want to.
The final reason to be happy is not mine to tell, but it makes me the happiest of all.