PM's replied to and have sent PM's to other that have asked.
Argh, this is pretty normal, particularly if your niche is not as well covered by bloggers as others. Since the autoblogs rely on other peoples posts...well, if few are blogging about it, then your traffic could crash and trickle.
Hot topics work really well for maintaining a steady influx of traffic. Right now, politics is huge. I had a Ron Paul blog up a few months ago that outperformed all my others. When doing niche research for niches that will get you a lot of autoblog traffic, check out Technorati. They have the hot topics listed there somewhere.
When niches are left up to me, I try to mix them up a bit with hot topics, financial (they make you more money in Adsense, but may have less traffic), stuff that appeals to internet users or teens, etc.
Hope this helps.
/edit/ just went to Technorati and the most searched item is "tato nano". WTF is that? A car.
http://technorati.com/search/tata%20nano
/edit #2/ tatonano.net, tatonano.org, tatonano.info are all available.
/edit #3/ this car was just unveiled today as the cheapest car available worldwide. $2500. So, the buzz surrounding it may last for awhile. Not sure, but I would be willing to bet that it's worth the cost of a domain to find out.