I'll start with a great frugal suggestion: http://dappered.com/
The site does a great job of tracking deals for you, recommending best options for less coin, and general tips on what goes with what. Light on feature posts, but heavy on savings, I recommend you bookmark.
A less frugal, but more feature heavy suggestion: http://www.primermagazine.com/
Without getting too
pretentious, Primer offers great guides on the ins and outs of styles for various scenarios.
An interesting tumblr: http://vavlt.tumblr.com/
Outrageous prices (IMO) on the links, but offers a great pictorial representation of simple outfits.
The 'given': http://www.styleforum.net/
Only just beginning to read this site on a regular basis, but primarily a discussion board for men's fashion