There seems to be a growing trend, especially in the SEO community, with bookmarking your own websites on sites like DIGG, StumbleUpon, Delicious, etc. The thought is that by bookmarking your own website you're gaining a backlink for your website and getting your new content indexed faster as Google crawls these websites on a regular basis.
Here's the problem:
Bookmarking your own website is against the terms of service on any of these major social bookmarking websites. Not only does it border on the definition of Spam but it also just clutters up the social bookmarking websites and dilutes any quality content that may be out there.
Having a link from a social bookmarking website is relatively worthless in terms of a backlink. Not only is it most likely not relevant to your website content but it also is diluted with hundreds of other links on the same page.
If your concern is getting your content indexed faster then this can be accomplished by simply submitting an updated sitemap to Google and pinging the spider.
I'm not flawless; I used to bookmark my own blog pages before I realized that it was essentially wasted time. Do you bookmark your own websites? If so, why?