I have a HP22 and it's amazingly accurate. They have very good customer service and a lifetime warranty. Heck, mine's eaten a diet of stingers without a lot of problems and I also have the 5" barrel. It's strictly a cheap plinker, but I have used it to dispatch snakes. It's a pretty neat gun for the money, snob appeal aside.
North American Arms .22 mini revolver of some kind
I've often though a mini master would be a way cool fun plinker. I have a standard 1 and whatever inch .22LR in a folding "holster grip". It's not a tack driver, but at close range I've taken a few rabbits and a few snakes with it. 20 yards is LONG range with the thing, though, but it's very well made and only needs a longer sight radius (as with the mini master) to be a lot more accurate and a lot more fun. Mine's okay, but ain't like I'm going to mow the coke cans down at 25 yards with it. The HP22 is a lot more accurate even if not nearly as well made. I carry that NAA everywhere, though, it's so danged easy to stash in a pocket.
Taurus makes a tip up .22 I know little about. I've read not so great things about it in the past, though.
My favorite gun that fits this category, though, is my Rossi M511 Sportsman, a little stainless "Kit Gun". Think is amazingly accurate and the SA trigger is fantastic if the DA is a pretty rough. It's a good lookin' gun, too, 4" barrel, adjustable sights. It's no longer offered, so you'd have to stumble into one at a gun show. They are not expensive.