Not sure what they're like now, but Moreover.com had horrendously huge javascript that would bloat out my webpages by over 100%.
7am.com uses a javascript tag (IIRC) which means that's all that's pulled from your site and the big chunk of javascript comes down THEIR pipe to the browser. A huge saving in YOUR webserver bandwidth compared to Moreover.
...I use javascripts.com...... if there is a particular one you are after let me know and I can send it to you or point you in the right direction..... I use them all the time in my full time job