Okay, just worked my way all the way through this very useful thread. Our contribution:
Harbor Freight Multi-Function Tool. We're getting to the end (thank the Gods) of a complete deck replacement, and use this tool fairly continuously, every day. We got two, eventually, and got the $5 extended warranty with each. With two we can both work at the same time, keep them set up with different blades, or with blades set up at different angles. Also if one croaks, you still have the other. They work great (though loud, I use ear plugs) and are about a tenth of the cost of the Fein Multi-Tool.
Another thing we love is the solar flashlights you used to be able to get at Costco. Not sure they're still there. Bright light, no friggin' batteries to change if you just keep them where they can get sunlight. VERY tough-- we melted one, and it's curved worse than a banana and still working...
Spotless Stainless is amazing in re-habbing corroded stainless steel.