Elsewhere on the Internet: Grammar Girl
If you think your English is pretty good–nobody’s is completely perfect–here’s a website for people who are ready for some pretty impressive grammar: Grammar Girl.
“Grammar Girl” is a website that’s more for native speakers–that’s right, even we make a lot of mistakes–so it includes podcasts on pretty tricky grammar points. If you’re still having trouble getting basics the verb forms, or sentence order, right, you might not be ready for Grammar Girl.
But, if you’re English is pretty good and you’re worried about keeping it good, not making it good. . . then the Grammar Girl might be good for you. Give it a look.
You might also be interested in:
June 13th, 2009 at 10:35
Tricky indeed…
A very useful site I think, thanx for putting the link up here!
In fact I will suggest some of my friends who have upper intermediate and advanced level to have a look here because I think it’s a great way to stay sharp.. 
By the way, I like the ‘Gossip Girl’- persiflage in it..