Hi, I've English blog, but for some unknown reason one page displays Chinese ads. check the screenshot, what is that? the page: http://www.sandrophoto.com/2007/11/
You can block the address within Google so they don't appear. I think from the ad its the ip address listed at the bottom.
adsense going global now, lol. maybe just testing phase, and your blog got choosen. or chinese traffic, or chinese advertiser, or just server bugs
maybe some Chinese egg-head smart arse kid hacked google system and he displays his add every 1000 receiving global exposure...