I agree on the linisher, I use mine all the time.
I've got a Multitool linisher atachemnt for my 8" Bench grinder. The stone on the other end is a fine abrasive for sharpeining tool steel for the lathe.
Here's the Multitool web page:
Multitool
The other tool I bought recently is a 40Amp plasma cutter. This thing is awesome. It cuts through 10mm steel plate no trouble and goes through 6mm plate like a hot knife through butter. when cutting sheet metal it cuts as fast as you can move the torch. In sheet it cuts nearly as clean as a hacksaw, No distortion and hardly any Heat Affected Zone around the cut.
Works on steel Stainless and aluminium too.
First time I fired it up I was giggling like a maniac and thinking about throwing my angle grinder cutting discs away.
Cheers