As a language learner, I'd be looking for sites that could meet my needs, for example BBC Radio 4 for listening/pronunciation, COCA (or similar) for vocabulary precision, certain blogs for style, etc. but one man's meat is another man's poison. More often than not, a good needs analysis and then google search of problem areas work perfectly well and help save time.
Incidentally, there's a good section of phrasal verbs and grammar/vocab quizzes, both printable and interactive, on this site.
On this, I have a question too. I'm looking for websites that allow me to have 1 to 1 spoken English sessions with native speakers. I think this is the best way to improve spoken English. Any ideas?