I love birds in the garden and have a number of feeders, bird houses and birdbaths. They all require work to keep them clean and filled or else they become a distraction instead of an attraction.
One of my favorite birdbaths is this blue glazed one for reason's other than the the obvious lovely color and structure. The glazed finish is much easier to keep clean than cement ones and it stays cooler. I didn't really plan it, but locating it in the shade cuts down on algae growth (although positioning it under a messy tree might counterbalance that aspect as far as trying to keep it clean). The birds love it too!