I actually have a lot of links that are super useful :]
There is...
www.lang-8.com - This site is where you can write entries in the language you are learning & those who are native in that language will correct you.
www.guidetojapanese.org - This site is useful with grammar :]
www.imabijapaneselearningcenter.com - This is my preferred site for grammar :3 It's easier to understand & breaks things down more so than the previous site :]
www.smart.fm - This is a very useful site for learning new vocabulary :] It has a TON of books you can choose to learn from :]
www.livestation.com - A place where you can literally watch channels from all over the world. Immerse yourself into Japanese television ^-^
http://kanji.sljfaq.org/kanjivg/ - A nifty sight that shows you the correct & amount of strokes for hiragana/katakana/kanji