I just switched from two 19" monitors running 1280 X 1024 to two 22" monitors running 1680 X 1050. If I run typical apps full screen now, they tend to have a lot of unused white space.
I'm typing into Firefox right now, and even with the sidebar open (which contains all my bookmarks), this superuser page still has 2.5" left and right margins. That's a lot of pixels I could be using for something else.
I recently opened a Microsoft Word document, and even with the gray track changes column showing to the right of the document, I still had two 3"-wide bands of used space on either side.
I tried changing the Reading Pane in Outlook from "bottom" to "right", but there's really not quite enough width to show the folder list, the email list, and the contents of the selected email without scrunching things a little too much, so I ended up preferring the reading pane on the bottom.
Some applications seem more useful right away, like PowerPoint (where you can make the Slides/Outline pane wider) and Excel (where you can see a lot more columns), but in several cases, I'm not realizing any benefit of the wider screen.
Now that you have a widescreen, what do you use your extra width for?
Do you have any tips for the applications I mentioned or other commonly used applications?