PyCon was great, in particular the tutorials on iPython (the latest versions have an awesome Mathematica-like notebook interface, where you can make rich multimedia documents with runnable code snippets) and the scikit-learn library (a powerful machine-learning toolkit).
Google's HQ is also cool (and huge!). Reminds me of college, really has a "summer camp for engineers"-type vibe. Despite some hassles involved in remoting, I was still able to get a fair amount of work done.
Looking forward to being back in Boston!