Does Lightroom work properly across a network?
I have all my photos on a central machine so that I can access them from any other machine around the house. Picasa only works naturally on a local machine so any albums or other grouping I do on one machine is not reflected on any other machine.
Actually I have found a hack that gets round this (allows each machine to see the same Picasa database), but it is too damn fragile! It corrupts if the connection to the central machine is lost for some reason.