Did I pick the wrong horse(es!)?
Well, as interesting/intriguing as Lineform has been, development seems to have slowed to a crawl, and the reality starts to set in that the app is still very new. OTOH Intaglio is mature, but it too seems to develop slowly, and frankly I've never been particularly fond of it's interface.
...oh, and don't even get me started in the vapourous Mac version of Xara Xtreme, following the break down of the open-source version, which was to form the basis of the Mac port (ugh!) Apparently Xara are still interested in pursuing a commercial Mac version, but time will tell.
All of these facts keep pointing to the 'dark horse' in Mac OS X graphics apps, DrawIt, and frankly it's surprising that this app isn't talked about more... I predict it will be! :)