Since Bookpool.com seems to have bought the farm, where is the best online bookstore for programming books now?
I hate to give the obvious answer, but Amazon has pretty much every book ever written, and usually has good deals.
If you're in the UK, www.compman.co.uk are excellent (often cheaper than Amazon, and have offers nearly every week for discounts and/or free delivery)
I usually buy used programming books on Amazon. Amazon's used bookstore facilities are great, and you can buy the books a lot cheaper when they're used.
I highly recommend Safari Books Online. They have a great subscription plan (starting at $22/month) which gets you immediate access to the latest tech books, and they don't fill up your physical bookshelf.
(copied from closed duplicate question)
If anyone's interested in an actual, physical bookstore, I urge you to check out Opamp books in Los Angeles. Excellent mix of general engineering titles, not just software. Also a great used section in the front where you can pick up some gems for super cheap. Best technical bookstore I've ever been too, and I've been to Quantam Books when it was still in Kendall Square.
Barnes and Noble.com has a large selection of programming books as well as a ton of used textbooks for sale:
Don't bother with Borders since they use Amazon to handle their books but I use Amazon all the time and with their drop ship points they have added I can get my books in a 2-3 days and that's cool.
STRIKE THE BORDERS COMMENT - I found out they seem to be hosting their own online service now. So, Borders is a good option.
Also, TechBooks for Free (http://www.techbooksforfree.com/) is kind of cool if a bit dated but free is nice..
Amazon, though cheap, is far from the cheapest. I buy almost all my programming books on Half.com. Today's books and the latest versions and hottest technologies can be a little pricey, but you can get manuals on last year's stuff extremely cheaply. I'm talking $2 for the book and $4 for shipping. I filled a shelf with C# and ASP.NET books for under $100.
The great thing about programming books is they're usually in great condition when used, and you really don't care about scuffs even if they're there.
I usually goto http://www.bestwebbuys.com/books/ to find out the cheapest one.
Alibris sometimes has phenomonal deals. I picked up Ruby Cookbook for ~5 dollars. :)
I'd recommend you join Bookmooch.com so you can pick up my copies of "Delphi 4 Unleashed" and "Professional DCOM Programming".
You could try Packt Publishing. They have a host of programming books. You may visit them at https://www.packtpub.com/