I want to write a 'launch post-mortem' entry tomorrow, but for now I wanted to encourage you to go download the new release of Mockups, as there are some pretty cool enhancements and bug fixes all around:
Bugs Fixed
- UI controls now end up where you drop them (again, this was an injection)
 - 'Text Paragraph' became 'Paragraph of text' and 'Text Label / String' became 'Label / String of Text', for better Quick Add behaviour
 - Checkmark for 'Show UI Library' works properly again
 - Undo/Redo menus tell you the name of the action again
 - Hitting Return after selecting all the text or dropping a control on the stage no longer deletes all the text. The previous text is now used instead (i.e. it's like hitting the escape key now)
 - Icons are black by default (not that weird blu-green-ish color)
 
Feature Enhancements
- Mockups for Desktop: I now trap a click on the 'x' and prompt for save if necessary
 - All versions: The 'selected' overlay is a little darker, no longer blends with the gray so much
 - All versions: added background color to DataGrid control
 - All versions: added background color to Tree control
 - All versions: removed modal overlay from text editing mode, it wasn't needed and it made for flickering screens
 - Removed the 'welcome to Balsamiq Mockups' starter-mockup from every version other than the demo on the web.
 - Mockups for Desktop: now using native menus!!!
 - Mockups for Desktop: all keyboard shortcuts work now and are OS-dependent (apple key on the mac and CTRL key on win).
 
Web Site Enhancements
- cleaned up the audio of the demo video on the Mockups home page to remove lip-smacking and other mouth sounds. Also republished at higher res.
 - added secondary navigation for the Mockups pages right under the breadcrumbs. Hopefully this will help some
 - fixed a typo and the 'wonky-ness' reported in IE6 (I think. Let me know if it's still wonky)