My new favourite Micro-ISV is Hog Bay Software, makers of Mori (my latest outliner of choice) and WriteRoom (which is rapidly becoming my preferred text editor for brainstorming and jotting down ideas).
Polished applications, polished website and seemingly very focused on the user community. And how's this for transparency: they publish their sales figures.
UPDATE: Another neat thing they do, which I forgot to mention, is give suggestions for alternative competitive products. For example, on the page for their timer, Clockwork, they say:
The truth is that computer timers are a dime a dozen. If you just need a simple timer I would try out Pester or one of the many other free timers that are availible. If you've decided to pay for a timer then you should take a look at Alarm Clock Pro. It seems to be the feature leader for OS X timers, but as a result it's not simple and may be more then you want or need. Clockwork tries to split the difference. I think its clean interface and full screen mode are what set it appart.
Wow! How refreshing.