Tying it into the website is the difficult part. :p
Not sure if you are speaking specifically or generally, but I will discuss further an idea I had in my last post.
Perhaps a news item that would be posted every week for resource updates. It would have the title of something like "December 12, 2008 - Resource Update" and would have a message body of images. The images in the message body would be like the tabs on Spriters Resource; they would be made to link to the resource topics on the site.
This may sound a little redundant in that there are preview images in the resource areas already, but some of the preview images are actually the entire image or have no relevance to the resources themselves. It would be something that people find familiar and upon visiting the site, they may find as a useful feature.
As for getting such tab images, I can see them as simply being a formatted square with rounded edges on the bottom and a space for the title on the top. Graphics would get their own color tab, audio would get colored tabs with a symbol on it of a musical note and a keyword for whether it was a sound effect/composition/etc, tutorials would get a colored tab with a preview of the tutorial if possible and/or with an indication of the language it was made in, etc.
As for getting images, the staff would do some ripping themselves, and user rips themselves would be added if they were made in the previous week. If an old resource had an update, a staff member could be notified and they could include the update in the next Resource Update. Once Windy's ripping tool gets more practical, getting resources should not be as difficult as well.
I'll work on a mock-up if you are interested.
Meh, !@#$% it, I might as well post it anyway:
And yeah, it isn't that great of an image, I made it in under ten minutes, but the concept lies therein.
