For grammar and usage questions:

http://www.bartleby.com/64/

Note: This will be slanted towards USn usage and grammar. Y'all Brit-leaners are on y'all's own.

Dear Faldage: Blessings be upon you. The word usage site there ought be mined by many members to produce interesting posts and replies. I particularly like the discussion of "decimate" which gave percentages of reponses by a pane of experts.
I'll try to choose some potentially interesting ones to discuss, and wistfully wish that others would do likewise.

to facilitate that, here's a direct link to the "word choice" section, which takes you to specifics such as "decimate": http://www.bartleby.com/64/3.html

Note: This will be slanted towards USn usage and grammar.

Good old Fowler is there!

Y'all Brit-leaners are on y'all's own.

Sorrite mate. Comes nachrel to us.