I've been looking for places to take my laptop and go wireless while having coffee in Tokyo. Some areas I haven't found anything yet (Shibuya for example!) although obviously such places exist. Just difficult to search for if you can't use Google in Kanji.
I suggest a thread listing the free wireless cafes you've found so far...

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), but I used to just walk into any downtown McD's and fire up my Sharp PC thing I got from work. Worked fine.