Worth subscribing to
Monevator is a UK website about 'making, saving, and investing money'. It's one of the best sites out there if you want solid advice on investing in a readable format. It is one of those sites I am always happy to see in my Digg Reader list.
I follow the site using RSS, but they also have an email list, a Facebook page, and a Twitter account.
The main features for me are a weekly link roundup that is really good (you may have noticed the surge in posts on the Facebook page on Saturday mornings), and a number of writers with different foci: passive investing, active investing, post-retirement, etc.
The site has a slight UK flavour, but a lot of the content (and the links in the link roundups) is universal.
Any other sites or blogs I should check out? Post them in the comments :)