My favorite spreadsheet-related web pages are listed here.

Etc

Let me start with this boffo site: www.oswd.org. These guys, Open Source Web Design, created the web page design that I'm using. The site is outstanding, and this design plugged in without a single problem. Well, okay, one problem... Microsoft's FrontPage 2003 can't handle the CSS stuff that OSWD uses. No matter... I'm using Nvu.

Oh, speaking of Nvu : www.nvu.com.  Nvu is an open source web page editor. I can't fully recommend it, however, as I believe that development on the project has stopped. I will say this... it's free and it works. It works better on CSS than FrontPage does.

Other spreadsheet programs

www.openoffice.org - is a very fine Microsoft Office knock-off. The hook? It's open source and is therefore free. If you don't want to pony up the $$$ to Microsoft, then download and try Open Office first. I tried their spreadsheet program a while back, and it worked just fine.
  • www.google.com - Google is now offering the next generation of Office tools. Their Docs and Spreadsheets programs work over the web and your files are actually stored on/at the Google server farm.  It's all free; you just have to register as a Google guy. This stuff is new and raw, and not nearly as polished as Excel or even Open Office. But, this is absolutely the direction we're heading, right? You can also try this link: spreadsheets.google.com 

Wikipedia

If you haven't tried Wikipedia yet, then jeez... try it. Here are some "history of spreadsheets" pages: