I now no longer even read the title when I see a "steveblank.com" url - I just click it, because I _know_ it's going to be good, and just overflowing with honest-to-goodness Wisdom (with a capital W). Not sure if Steve reads here, but I want to put my thanks out there for each of his postings.
I have to say I sometimes feel guilt when I'm not working on my start-up. I know how long the to-do list is, but however much time I do put in, I also know that sometimes I just need to take an entire 2-day weekend off, and not think about it. I'm pretty sure the benefits I get from the break outweigh the "lost" time I wasn't working.... but I still feel the guilt sometimes.