Lifehacker. Getting less useful though I have to say since Gina left, but still in my Top 10.
HowToGeek (www.howtogeek.com) Gradually seems to be overtaking Lifehacker for me. Especially since Jason Fitzpatrick moved over there from Lifehacker.
Digital Inspiration (www.labnol.org). Less frequent posts certainly than LH and H2G but of good quality.
Productivity501. Not just tech but has some good tech tips.
Evernote: If you’re going to allow yourself Twitter, then I must be allowed Evernote! Every tip I like and feel that may come in handy in the future, is stuffed into EN, so if I do need it later I can find it easily due to EN’s great search ability – and I only have to look for it in one place rather than in any one of 10/15 likely sites/blogs!.
40Tech. Of course!