I've been busy developing so I haven't replied much but I just wanted to quickly say 1) thanks everyone who donated so far (currently full time through October 27)! and 2) I'm still on track for a (binary-only, sorry) testnet version for October 15. It will be binary only to prevent copy-cat coins. If you want to try out the Zerocoin testnet but are the type of person who only trusts compiling from source, I recommend running on a dedicated machine or in a VM.