I have never, to my knowledge, been on the Delicious front page. However, they're the only social bookmarking I have ever had success with. Slap that beautiful, beautiful Delicious button which says "X people have saved this" (social proof!) on a meaty reference article aimed at geeks and you'll get a long-tail stream of tech-oriented linkerati visiting that page for years, rather than the typical big-one-minute-gone-the-next tidal wave of ADHD chipmunks hopped up on crystal meth.<p>This has resulted in a few of my reference articles getting more than enough links to justify the pixels.