In no particular order...

Take Care of Your iBook batteries...IMPORTANT INFO FOR LONGER BATTERY LIFE!!  Go to http://www.apple.com/support and review articles 10751 and 58450 Learn how to calibrate a new battery for optimal performance.  Another good resource is http://www.batterytech.com/faq.htm.

A free, Quicktime-based index and tutorial for using Mac OS X. http://coe.sfsu.edu/osx

Read, Type, and Learn. Reading software that includes phonics, spelling, keyboarding and word processing! Special features for students with learning disabilities (LD), reading difficulties, or learning English as a second language (ESL). Network version in beta for Mac OS X. http://www.readwritetype.com.

Alternative to Press Writer for X. Step up to Print Explosion Deluxe, the fastest, easiest way to create one-of-a-kind custom greeting cards, signs, banners and more. It's easy to use, so you don't need to be a computer whiz. And with more than 8,800 ready-made professional designs for virtually every occasion under the sun, you don't need to be an artist either. http://www.novadevelopment.com/products/productinfo.aspx?productcode=pdm

Here's a set of educational trivia quizzes on a variety of topics. One of the most popular areas of the website is the Word Search Puzzles. There is a quiz generator which allows users to create their own word search puzzle and print it out. http://www.cooperis.com/quizzes

Need to retrofit early versions of the iMac to make them compatible with Airport?  You can now.  AeroPad 802.11b Wireless USB adapter from MacSense.  Also, with a plethora of USB devices available in Mac-compatible form, it's tempting to rush out and buy a USB adapter card to shove into your old Mac's PCI slot. Note, however, that these adapter card's are not strictly plug-and-play. In order for one of these cards to work in your old Mac you must have Apple's USB Card Support software and the card must comply with the Open Host Controller Interface (OHCI) standard. To determine whether your card meets these standards, check the outside of the box before purchasing the card or contact the card's manufacturer.