I like chlorine tablets for convenience, too. But keep in mind they don't help much against chemical pollutants. Though to be honest, neither does boiling or most other conventional methods other than quality filters.

A little off topic but I have experimented lately with the Lifestraw:
http://en.wikipedia.org/wiki/LifeStraw

Interesting concept and seems to work well so far. Should be pretty effective at what it does if the advertised info can be trusted. In any case, it comes in a fairly compact package and the water tastes just fine.