Find out what’s trending on Twitter and why at WhatTheTrend. Each query shows an explanation by users about why a #hashmark or term is trending. Related posts: Twitter Trends Manage Multiple Users Over Several Twitter Accounts Join Twibes Twitter Groups

You can get cache, search and feed info on an URL on FaganFinder, but our favorite feature is the links section. You can get link info on BlogPulse, BlogLines, Technorati and more without having to reenter your URL or waiting for a refresh – nice! Related posts: Check Your Site

Sign up for a free account and get a personalized e-mail address to send your Twitter updates to at Twitter Mail. E-mail your updates and they’ll be automatically posted to your Twitter account. Related posts: Twitter Multiple Account Manager Feed Your Blog To Twitter, identi.ca, HelloTxt or Ping.fm Get Free

Sign on to your Twitter account through Twitscoop, then tweet, find friends, get trends, live search and stats. Related posts: Twitter Rank And Stats Join Twibes Twitter Groups Visual Twitter Network Browser

What are the most popular URLs people are sharing on Twitter right now? Track popular URLs and identify trends on Twitturly. Related posts: Track Topics On Twitter Twitter Trends Track Your Twitter Searches

Analyze conversations by Twitter ID and find relevant and influential voices about a topic based on replies between Twitterers on Twitter-Friends. Related posts: Twitter Karma Search The Web By ‘Conversations’ Visual Twitter Network Browser

Based on Google search results of course, this Google tool shows you relevant keyword ideas and their Adwords competition for your website.   Related posts: Get New Keyword Ideas Stats On PPC Ads Monthly Keyword Search Volume