^His blogs are an endless source of inspiration :p. Been meaning to mention that before.
If you want a simple project to start, I would check out fixing up an older used electric brushed motor scooter. These tend to retail for 400-700 dollars, but can be purchased used for <$100. And, almost always, it's just the batteries that are dead, and maybe also the throttle. From there you can move to just plugging in LiPo or going as far as retrofitting some RC motors and necessary controllers.
If you're into something more, then by all means, jump way ahead. I'm kind of stuck with an electric brushed 1000 watt standing/sitting scooter right now that I got quite bored of. but, I'm not quite yet at the level to decide or jump all the way into any more hardcore scooter projects I've been dreaming about. At least right now my tech/money/time isn't there.
New to endless-sphere? Notice a lot of signatures recommending Ebike.ca? That's because it's the best place for a quality and manageable, (but still 'real'), first build. Justin is a solid supporter of electric bike development, and a good source of equipment.
My hat off a thousand times to the green people that effectively run this forum. The ES Mods are superb.