This is not official, but some people have found that Google has a service that returns a given webpage without any graphics or ads. This is clearly useful for mobile users that have a limited amount of bandwidth to use. Nobody (outside Google) knows how this service is called, but it may become official sometime in the future.
According to ZDNet.com:
Here, look! New Google service strips out ads and pix from websites by ZDNet's Russell Shaw -- What if I were to tell you I've found a way to use a thus-far unannounced Google service to strip out the graphics from your favorite Web sites? Something ideal for Web browsing over dial-up PCs and low-bandwidth, non-broadband handsets?Well I think I stumbled on it.This unbranded Google "service," if that's what you call it, [...]