The problem with full electrics are that assuming your power source is from fossil fuel, they are a net loss from an environmental perspective. Too much energy is lost in getting the power from the plant to the batteries. Not to mention, those cells have a finite cycle life and can't be recycled, as far as I know.
I would say that there are probably alternatives to generating electric that are cleaner. Hydroelectric, wind, solar etc. Plus i would also say nuclear to electric.
However, I would agree that disposal of the Li-Ion batteries are going to be an issue. I'm not sure if this is really better for the environment. Less dependent on foreign oil, possibly. Better for the environment. Not sure.
However, I'm not a big fan of hybrids. I don't think the fuel savings are worth it.
If I had the money, I'd seriously consider a tesla roadster. Aside from no gas, the torque curve of this car is amazing. Essentially a flat torque from 0-6000 rpm. Instant "on" the moment you step on the gas (uh I mean accelerator). This will eat just about any sports car alive.
Unfortunately, $100k is just too steep. I hope tesla builds a sedan thats more "affordable". I believe the mentioned the possibility of a sedan in the future for about $50k. However, I doubt this company will last. There's already some management changes going on, and Im not sure if their really going to penetrate this market even with a $50k sedan.
There are other alternatives. GM is apparently working on something called the Chevy Volt.
Car will start at $30k, but battery not included (seriously). GM is considering letting the customer "lease" the battery.
In general, if you are interested in green(er) vehicles, autobloggreen has a wealth of information on what is going on. (no I'm not advertising for them, just a car nut).