Replacing Crankset. Do I need to replace chain? Then do I need to replace cassette? Over the past year, my road bike's crankset has gotten pretty bent up and out of wack. Not due to abuse, just wear and tear I guess.  It's pretty bent and has a nice wobble that I can see as I look down at it while pedaling.

So I'm interested in replacing the crankset. But I've read there are various rules of thumb to follow when replacing cranksets, chains and cassettes. When you replace one you have to replace the other or something along those lines. Something about teeth wearing evenly.

Do I need to replace anything else if I replace my crankset?
If you replace the crankset you almost certainly get new front sprockets.  Compared to the cost of the crankset and sprockets a new chain is chicken feed, so get a new chain.

Whether you need to replace the rear cassette is a whole 'nother question, pretty much independent from the front.  If the cassette is badly worn it may cause your chain to wear slightly faster, but not enough to worry about.  And you may find that the rear shifts poorly with the new chain, or suffers some "chain suck", but probably it will be OK, if it is now.