if scott reifort does WSI, then not really. it's a difficult page to navigate, kinda cluttered, and of the "big four" (as posed by sports illustrated) i tend to prefer soxmachine. south side sox is a little too "on the ledge" for me, WSI is poorly designed, and the other (i forget what its called) i wasn't even really aware of until the poll.
some other blogs (more general baseball / sport oriented) that i regularly read are:
the hardball times - lots of numbers/stathead stuff, but very well written. it's tough to combine those two traits, as certain writers of BP and other stat-oriented blogs show time and again. THT also does some good work on the business of baseball (i.e. stadium deals, contract evaluations, union vs. ownership, etc.) and interviews with other writers. their yearly annual is a great read, too, and has a lot of unique information that can't be found in the bill james handbook or anywhere else; i haven't tried their yearly "forecaster" but i have a feeling their forecasts are more accurate with regard to peripherals as opposed to dead on numbers.
www.thehardballtimes.com
can't stop the bleeding - written by gerard cosloy (co founder of matador records) and david roth (of slate.com), targets mostly poor journalism and "who you crappin?" type of statements nationally. they also have a healthy dose of ire targeted at deadspin, which can't be a bad thing.
www.cantstopthebleeding.com
fire joe morgan - a blog started by some friends that grew out of an email list in which they ridiculed certain baseball personalities for their hilarious "insight" into baseball. regular targets include: david eckstein, anyone who says j.d. drew isn't a "ballplayer" and alex rodriguez isn't a "true yankee," and of course, joe morgan and tim mccarver, as well as big-name nat'l journalists (plaschke, shaughnessy, murray chass). the pieces on joe morgan's espn chats are a must-read.
www.firejoemorgan.com
mlb4u - a site / blog centered around player contracts and team spending. generally up-to-date facts and figures that are helpful for friendly argument and writing alike.
www.mlb4u.com
fangraphs - site and blog dedicated to charting WPA (win probability added) for every game of the season. they've added live charting, as well as historical charting, which is pretty awesome. kinda nerdy, but worth a look.
www.fangraphs.com