Has someone written a decent keywords plugin?

I'm looking for something that will add keywords of my choice into every post. If someone hasn't done this, they should! I'd like to have a huge array of keywords, related to the whole spectrum of my niche, which could get inserted at random, or into a specified area of the post. Anyone know of something like this?

Market Samurai gives you the option to find a whole bunch of keywords related to the one you input, then you can export it.

Ah, didn't know you could export - good tip. Still, would have to cut and paste. What about a plugin which could do that for you, and then insert it into the post. Would only work for autoblogging but thought it could be a good idea.. thanks Zdmas..