Since the Intel graphics controllers nowadays have dynamic RAM allocation - the amount of video RAM can vary depending on what you're doing - for example, while word processing, the graphics controller may only use ~4 MB, but when playing a game (hopefully not ), it can allocate as much as 64 MB (shared) from the main system memory.
All in all, if you had the money, buy a new videocard. (mobo, if possible, if you obviously want an AGP)
Yeah, soon after Intel released the 810e they realized that not including an AGP slot was a bad idea.. shortly after, they released the 815e, which was basically identical but included an AGP slot in addition to the onboard video. IMO onboard video is practically useless unless you are trying to build a low-cost internet surfing machine.