Which PLR article topics sell the most?

I've been seeing lots of people selling PLR article packs online lately. I would like to do that too, but I don't know which topics to focus on. Which topics should I write PLR articles on in order to sell as many article packs as possible? Are there research methods or websites I can use to find this out?

Thanks

I tried asking for PLR info here and didn't get an answer either.

From what I've seen on sites like TextBroker and Constant Content, what sells the best is Business, Finance, Computers, Internet, Health and General Tech.

Those sites don't sell PLR, but it's probably the same, when you get right down to it. You could probably add Pets to that list and not waste your time.

Anyone else?

It's best to create and sell PLR as an offshoot of whatever original writing you are doing for other purposes. That's the natural way to determine if they are worth buying as a pack. Search for keywords and new trends that are in actual demand, and write 10-12 articles about them for your own site, Yahoo Voices, freelance, etc. Then bundle them or a rewritten version into a PLR pack. In theory, you could write and publish articles for a paid directory, that you are also using for an MNS, and bundle them for PLR resale or an ebook/ecourse. Write once, profit 3-4 times.