1296: 官话

Regarding chinese learning resources, I am particularly impressed with the following

1. Routledge Modern Mandarin Chinese Grammar - A Practical guide
2. Routledge Modern Mandarin Chinese Grammar Workbook
3. Rapid Literacy in Chinese
4. Wheatley, J. K. Learning Chinese: A Foundation Course in Mandarin. and the associated courses at MIT OCW

also in terms of Online reference/assistance/practice

1. Livemocha - a very useful community approach to learning languages. (most of my chinese friends were made here)
2. Pin1Yin1 - helpful at initial stages thanks to the hanzi to pinyin conversion tool (I probably use it more than gmail these days)
3. Shuifeng - Eventhough the 笔顺 (stroke order) is relatively simple, it is nevertheless awesome to have a reference
4. Zhongwen - Too useful and obvious to be even mentioned

-晁淳 (Dawn Simple)