Replied.
Minimum Offer: 0.1 BTC
Glad to see a bounty going! Though I'm not sure what the minimum offer is about. Is anyone trustworthy willing to escrow the bounty, especially if we get anyone else pitching in? Then they can decide if the project would meet the specs satisfactorily.
As for an update, no code yet since no one else had expressed interest and specific bounties weren't mentioned. But I've been going over GBT more and checking out eloipool in a bit more depth. I also think some components of bitcoinjs-server could be helpful in building the pool.
Also, people, if you want to see a node.js pool server, say something (surely a little bit of variety in pool server software is a good thing)! Or even better yet, chip into the bounty! I'm afraid it does need to be a bit more to make it a priority project for me.