Tips on improving one's English are off-topic for the site. I wanted to make sure that people feel the same way about the following writing related questions that RegDwight brought to my attention:
...we do have quite a few (open) questions about improving writing skills: Recommended books on writing well, Tips and Tricks to Become a Better Writer, Which is the best way to improve your writing skills, and even Advices and tips for writing tutorial. I am not sure if any or all of them would be a better fit for Writers.SE, but right now, they're all here, and they're all open.
If you look at the answers, you can see why we would want these to be off-topic. There are few answers and those that are there are subjective and chatty.
If I had noticed them right when they were asked, I almost certainly would have closed them. I was going to close them now, but I noticed that there were very few votes to close. In fact, one question was voted to 6 and the other was voted up to 9 with 5 favorites. This really surprises me.
I personally feel that these sorts of questions do not fit in with EL&U: they aren't really about language usage itself, they are too subjective, and in some cases they don't really seem to have a clear answer (subjective or not).
As I said, the only thing that stopped me from immediately deleting these questions was the lack of downvotes and votes to close; these sorts of questions are off-topic, aren't they?