Filtering depth depends on location in China
Having recently returned from a long stint in various parts of China:
Net censorship depends entirely on which city or province you happen to be in. If you're in a more developed city or province (think Beijing, Xi'an and Shanghai) restrictions aren't as tight as you may think. Keyword filtered is also not nearly as serious in these parts.
However, even in Xi'an, in a non-tourist hotel, ie: one with no olympic logos, 2 or 3 star rated, things are very different.
I had trouble even accessing hotmail using the normal web address - using Tor or similar style of proxy was the only solution, which likely points the filtering bypassers to the government. At first I dismissed the filtering/censorship claim, but after travelling about all over the China it quickly became clear that different province administrations have different levels of censorship and filtering, which could potentially bring up the population with entirely different general median opinion.
I began to wonder if this was an overall plan by the Chinese government, or if it was really just to ensure tourists were initially mistakenly under the impression content is not filtered or blocked by China. A few people I know in China believe democracy will come in ten, fifteen, twenty years. Right now it's very obvious, with regards to internet access, it's very much the same as it has been since the "great firewall's" inception.
Just for the record, I stayed in both local flats and cheap hotels, so have a broad view - those who just stay in hotels when visiting the country will likely not be aware of the severe keyword filtering and website blocking of certain IP ranges which I experienced.