Hacker News : Paul Graham's startup culture & webdev link aggregator
Hack A Day : more computer-engineering-y, hack-y stuff with a mix of tutorials and project breakdowns
Lobsters : higher-quality, invite-only HN clone with a few improvements and a focus on PLT
Lambda the Ultimate : for those wanting only PLT and nothing else
Ars Technica : more consumer-focused tech news, although some science content and good in-depth reporting keep it a cut above mainstream
Practical Common Lisp : one of the classic Common Lisp introductions, written for people who already know how to program but not how to Lisp
ZipCPU Blog : incredibly clear, concise, actively-updated FPGA blog with a pleasant writing style and large backlog
Joel on Software : Joel Spolsky's blog on user interface design, startups, software engineering, and more, with a truly ridiculous amount of content and some of the most technically skilled writing I've seen on the internet