Anyone know of an app people can use to save website designs?

Just wondering if anyone knows of a useful web app that one can use as a kind of scrapbook to save websites into?

When you come across a site that is really nicely designed and you want to save it for later, instead of saving them as screenshots (which you can't 'browse') you can save them as a timestamped browsable website (for which you could set the number of levels you want to save linked pages).

Just saving the bookmark doesn't work because if the site is modified or redesigned you're out of luck.

Just wondering...