I've just learned about the coolest web app - YubNub. I read about it in Roy Osherove's blog. What it does is, it gives you a "command-line interface" to the web by allowing you to type in simple commands and then transfering you to corresponsing URLs. For example, to browse an entry in WikiPedia, I usually type-in to my FireFox: http://en.wikipedia.org/wiki/X where X is the entry I'm looking for. In YubNub all I have to do is type-in wiki X and whammo! I'm there. YubNub has tons more of useful commands...
I've just discovered del.icio.us direc.tor which is an innovative and powerful user interface for managing your del.icio.us bookmarks. You add a bookmarklet to your FireFox (or MSIE) and launch it when browsing del.icio.us. What you get is a drop-down list of all your tags. Choose a tag and another drop-down list is populated with all related tags. Choose a tag from that ddl and the process continues. This is an excellent way to find links through tags and to see which of your tags are useful and...