I didn't realize Slashdot still had that kind of traffic. Good to know. You're right about HN users. They don't tend to Digg or Reddit you much. But they do stick pretty well if your product is in the category, so they're worth quite a bit on their own.

Definitely I would recommend just running a blog on Wordpress.com or TypePad or blogspot. Some service that can withstand the heat of any big press releases. Just in case. You can spend a few bucks to make it look like a subdomain of your main site anyway. Blogging can net you some organic search traffic too.