I'm doing a little computer spring cleaning today, and as part of it I went through my Internet bookmarks. It's amazing how some I relied on regularly months (or years) ago aren't useful anymore. There are some, though, that I refer to time after time. Some of the more interesting ones:
BookCrossing-which bills itself as The World's Biggest Free Book Club. It's popular enough that in 2004 the word was added to the Concise Oxford English Dictionary, where it's defined as the practice of leaving a book in a public place to be picked up and read by others, who then do likewise. It's always fun to get an e-mail indicating someone has released a book in my neighborhood. Sometimes they're gone by time I get there, but I've been able to find a couple of real gems thanks to BookCrossing.
I've been sending 123 Greetings' e-cards for years. Although there are a lot of sites that offer electronic greetings, 123 Greetings is free and has nice cards. That's enough to make it my default choice.
A friend recommended Paperback Swap a while back. It's an online book swap where you can trade books for just the cost of postage. The site works on a credit system. Most books you request cost one credit, but audio books cost two credits--still a great deal. You receive credits for each book you mail to another member.
Slickdeals is a compilation of deals, coupons, and bargains that are submitted by members. Although many of them are Internet-based, there's also a good selection of deals from brick-and-mortar stores, and a separate tab for coupon offers.
Check A Charity is sponsored by the Attorney General of Missouri. It has information (voluntarily submitted by charities) about the percentage of donations that go to their charitable purpose and what percentage is used for administrative costs. Helpful when deciding where to send my money!