So much for good intentions...

As for posting every week, that idea went down the drain, much less every day. At least now, with my new laptop (a 17" beast, if I do say so myself), it might be a bit easier to keep this baby updated.
The discussion of the week is book trading sites. Do they work, are they really free, etc. I have been using paperbackswap.com recently, and it seems completely legit so far. The basic idea is, for free, you create a membership, post books, and get credits when you send a book off to a requester which you can then use to order books from someone else. Upside: books are in good condition, and the people send the books off promptly. Also, the $2-3 shipping is definitely cheaper than buying the book even used. Downside: the books you have posted might not be books people want, and then you get no credits. Sad. Also you do pay postage, and the process of ordering/sending a book is a multi-step process; if one of the people slacks on their updating, the sender won't get their credit. However, this hasn't happened to me so far, so I give this site a thumbs up.
One I just found was Textbook Revolt (textbookrevolt.com). This is a book trading site that works on the same principle as PBS, except only for students and textbooks. You need to be a student (i.e. have a .edu email address.), but I'll give thumbs-up to anything that will help me save the $100+ per textbook, even if I have to pay a postage to send off a book. But, because of media mail, it only costs $3 or $4 dollars. Hallelujah, a respite for all us poor college kids!
And, although this isn't a book trading site, per say, I must give a shout-out to Better World Books (www.betterworldbooks.com). They sell new and used books of every shape, size, and subject for REALLY cheap, and also buy back books. They donate most of their proceeds to literacy in Africa programs, and you can donate a percent of your buy-back money to the funds as well. BWB is the group that sets up the "Donate your Textbooks" boxes during buyback season.