This is absolutely one of the coolest applications out there. Balsamiq Mockups allows you to quickly and easily mockup any sort of desktop application, web application/website, or mobile application. Watch the demo and be amazed.

The web is full of some really interesting articles that compile great examples of beautiful web graphics, and these can serve as great inspiration. I have, in fact, been known to tweet a few of these articles, from time to time. What I worry about, however, is a confusion I sense among designers (well, to be perfectly honest, mostly among web designers) who equate fun web graphics with great web design.