Here are three websites that really helped me in my Chinese studies.
1. Mandarin Tools - This is the site I use whenever I want to look up Chinese characters or their pin yin and translate them into characters, pin yin, or English.
2. Chinese Pod - I used this site to listen to their free podcasts. Listening to all those podcasts really helped me out when I first started. If you are interested in investing money into it, you can pay this site some money to upgrade your account to something suitable for your level of chinese.
3. Skritter - i use this site to learn chinese characters. i haven't found a site like it to this day. they test you on your character knowledge by saying something in chinese at which point you need to write the character out with your mouse or trackpad, etc. it sounds a little difficult, but it's actually really easy to get the hang of it!