Man, oh, man do I love this web application. Love it, love it, love it! I think the graphical-interface "hive builder" feature that I get a kick out of most. I like that I can actually keep track of equipment in that way.
I understand it isn't iPhone-compatible (yet); but that doesn't really bother me too much. I can take a notepad and pencil out to the apiary; I think the electronic device is better off waiting until my hands are clean, ha!