This was a quick 15 min hack last night based on the new API. It's different from the original bookmarklet in two ways:
1) If the URL is already added to HN, it will go straight to disucssion thread, without automatically voting
2) If the URL is not yet added, it will ask if you want to submit it
Nice. I've got a bookmarklet I wrote exactly like this, which has morphed into chrome extension to automatically notify you when their is a HN discussion for the page you are on. Should polish it up and release it. Good work
Doesn't work in Opera 11.11. Really good idea though.