I still use it for some things, but there's not really a whole lot to discuss; the price is stable, Silk Road is still running, people are still taking it for donations. Infrastructure isn't always exciting.
One actionable topic that could be discussed: does the current price reflect what we expect Bitcoin's value to be?
Less Wrong used to like Bitcoin before it was cool. Monthly threads popped up around the same time a pricing bubble brought mainstream attention last year. When the bubble popped, and price continued to deflate, discussion on this site stopped entirely. Was there a change of sign in the social status of the topic, is the topic fully explored, or has there simply happened nothing of interest over the last year?
If you are not familiar with Bitcoin, here is one intro I happen to like.
Kaj Sotala lists a number of previous threads on the topic:
Less Wrong seems like a good place to discuss recent developments, if one does not want to suffer the inanity of the officially unofficial forum. If you are not longer interested in Bitcoin, perhaps send your remaining balance to the Singularity Institute?