To solve the early stages, I use:
http://www.MockupMagnets.com
Very fun magnetic UI widgets for prototyping on a whiteboard. You should try them!

If you would like to do a review, just let us know, we would be happy to help.

Thanks!

* After ‘Quick Add’ clicking f2 doesn’t go into edit mode – this is intentional, so that you can “rapid-fire” add controls as you think of them, like I do in my video demo here: http://www.balsamiq.com/products/mockups – to edit the control you just added you can hit ESC and then F2…edit, hit ENTER or CTRL+ENTER and hit / or + to go back to Quick Add, all without using the mouse.

* Dragging items from the strip doesn’t show the guides – yup, that’s already on the to-do list. Unfortunately because of the way the code is written this is not an easy feature to add, but we’ll figure it out.

* It would be nice if there were a better way to select a set of items without moving the item beneath it. – SHIFT+click and CTRL+click don’t work for you? I do like the idea of a modifier so that clicking and dragging won’t make the control that’s under the mouse steal the focus, let me look into that, this is a great idea.

* highlight locked items on right-click menu hover…wow, cool idea. Not sure how easy it is to implement, but I’ll add it to my TODO.

* smaller fonts in tree – great catch and easy to do, I’ll add that soon.

* Ability to click through from one mockup to another to create workflow – you can do that now in 1.6! http://www.balsamiq.com/blog/?cat=14 – (no HTML generation at the moment)

* Ability to regroup after ungrouping items – what I want to do here is let you double-click on a group to “enter it” and edit its contents.

* Radio and Check Box controls should allow adding multiple at once similar to Dropdown – this is a BRILLIANT idea, we’ll add it right away.

* It would be nice to have right-click context menus for some operations like grouping or ungrouping – yup, already on the list.

* Layers – hmm, I’d like to avoid this if at all possible…this is not Photoshop! Once we get the selection modifier in I hope you won’t feel the need for this any more.

* Ability to add custom widgets – often requested feature, on the TODO. The only tricky part is how to manage those (adding / editing / deleting) in an easy way. Also, once you have a widget you’ll probably want to create a propery inspector for it…slippery slope.

* Favorites bar in addition to the current ‘All’, ‘Big’, ‘Buttons’ – fairly easy to do, I’ll add that.

Once again, thank you SO much for the feedback and the great ideas, I hope to implement them all and make Mockups that much more useful to you and others!

Peldi