Online

Spending most of my sunday online...learning.
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www.grammatikdeutsch.de This site is completly in the german language so it's that more difficult. But I think that's a good thing to learn directly through german. I did a very helpful tutorial on the cases eg. Nominativ, Genitic, Dativ, Akkusativ. Which was a great success, I know feel like I understand what I couldn't grasp in 50 mins teaching with a class.
www.german-grammar.de It's like an online grammar book, with table of contents and chapters. Lots of excersises to do where you tick the box to answer. It has audio where you can hear the word pronounced. The only negative feedback on have on this site, is that it almost gives too much information, like many grammar books do the same.
http://dict.leo.org - excellant online dictionary for fast and accurate translating. It was recogmended to me by my lecturer. It's really helping me especially when I'm working straight to typing on word documents.