First, I want to say how great WP is and I'm really impressed with how well it looks and how well it works. I'm new to it, but it makes building web sites really fun and accessible to those who haven't had the time to learn any scripting/coding. Kudos on this awesome product.
An idea: I have a large number of widgets available to me. Most of them belong to plugins I've installed. It can be a little difficult to spot what I'm looking for in the widget screen. I think the Widgets screen could be organized to make it easier to work with.
A shaded box could be drawn around groups of widgets belonging to a particular plugin. Maybe these boxes would be collapsible so that only expanded groups are visible. Or instead of boxes, maybe something closer to vertically oriented like a list. Anything to make it easier to see what you're looking for.
If you have time, please check out my page; [site link moderated - please use the Your WordPress forum if you want a site review]
Also, please 'like' my Facebook page: [non-WordPress site link moderated]