It seems most planets I come across begin as being "Rich" in resources. And Palladium in particular is extremely abundant. However, probes aren't free and I haven't found an in-game mechanic for translating surplus resources into credits. Fortunately, I'm fairly certain that the number of items to be bought with these resources is finite. (That is, if you ignore the fact that certain ship & crew "upgrades" can be re-purchased infinitely.)
So, I'd like to know how much of each resource is needed to research all available upgrades to their maximum level, and to use each re-spec/re-train upgrade once.
In my case, I'm playing a new copy of Mass Effect 2 on the PS3. This includes the Cerberus Network DLC (which includes several component DLCs) and Lair of the Shadow Broker.