Be productive and organized...
Doodle helps scheduling meetings and other appointments. Doodle is simple, quick, free and requires no registration.
Wolframalpha is a computational knowledge engine. Instead of searching for websites, it gives you facts and answers.
Free automatic bibliography composer
Similar to EasyBib, Ottobib is a simple bibliography tool that allows users to enter multiple ISBN numbers for books at a time and retrieve the bibliographies in MLA, APA, AMA, or Chicago/Turabian format.
Social annotation and bookmarking service where users can bookmark sites and add highlights and notes to them.
This webpage has links to tutorials on Excel. Creating spreadsheets and many other Excel features.
More neat stuff...
30boxes - online calendar
Assign-A-Day Calendar Maker - online calendar
Create a Graph - all kinds of graphs can be created – save, share, print
Google Docs & Spreadsheets - create/collaborate/share - free online word processing/spreadsheet creation tools from Google - tracks revisions
GoogleAlert - track your interests on the web
Groupboard - Groupboard lets you set up a multi-user whiteboard and put it onto your web page. Teachers have been using Groupboard for over 10 years for tutoring and distance learning.
Krunch (xfutureblog.com) - compress & uncompress files online
Letterfu - one page fold & mail letter template
NumSum - online spreadsheet
Pageflakes - your personalized startpage to the Web
PrimoPDF - free PDF converter
Remember the Milk - manage tasks & receive reminders (email, SMS, IM)
Skype - voice over IP – telephone through the computer (free calls within US/Canada)
UStreamTV.com - create your own Internet broadcast tv show in minutes with a camera and an Internet connection
snipurl - snip your long URLS to make them easier to remember
voo2do - track/organize/prioritize tasks & projects