I figured I'd have fun with the typical "learn me" thread title.
My new house has a single car garage with an uncovered concrete floor. I would like to protect it since getting stains out of concrete is a PITA. I've heard of interlocking floor tiles (some have a mesh look, others are absorbent and replaceable) and of floor epoxies. I've done some research on the floor epoxies and so far 3M and Griot's Garage coatings seem to get good reviews. Anyone have any input in which will be best?
All I know is you've got to really clean the floor with whatever procedure they recommend. If you want to see what happens when you don't, I can send you photos. (no, I didn't roll it on myself) 
My garage came to me with a polished concrete floor. It's great. I'll never have to deal with the coating coming off, the creeper rolls smoothly, it's super-easy to sweep and it's completely maintenance free. I expect it was done when the house was built 35 years ago, and nobody's had to do anything since.
How do you polish concrete? Is it something that has do be done with fresh concrete?
In reply to Keith:
Isn't it slippery? How does it react to chemical stains?
Yea, you polish it when it's fresh. No it's not slippery. It pretty much just doesn't stain.
Polished concrete is #1 in my experience. Everything is a distant and poor second.
Polished concrete is what most of your large manufacturing facilities use for a reason. Its gorgeous.
I have no idea if it can be retropolished. Call a concrete guy, I guess.
It's about as slippery as the tile floor in the kitchen, maybe less. Mine isn't super-glossy, it's just nice and smooth without the usual graininess of concrete. It's an added bonus when you go to paint, because normal concrete is both a dust trap and a dust creator.
I've built two cars on that floor with all the attendant spills. None of them have needed more than paper towels or kitty litter to deal with, and I don't think I've managed to stain it. Never noticed if I have.
What's resale like with polished versus a sealant? You'd think the sealant would have more "wow" factor.
Osterkraut wrote:What's resale like with polished versus a sealant? You'd think the sealant would have more "wow" factor.
It will also have a huge "Wow" factor if it begins to peel up. That won't happen with polished concrete.
What about not caring if you stain your floor? 
I have a handful commerical/office type varity of carpet squares in my garage, and I was considering covering my whole garage floor with them. I'll have to check to see if oil will seep through or not...
There was a thread on here a while back where vinyl composite tiles were recommended by a few people. Those are the tiles used in offices and commercial buildings.
Traffic Master has some commercial/industrial "floating floor" systems that look pretty good too. I saw a display at the big orange store. They were ~$2.99/sqft though - maybe not as grassroots as one might like.
