What do you do to prevent rust to your hand tools?
I learnt today that hand tools don't keep themselves rust free by themselves. I store most of my tools using the cunning "on-the-bench" storage system. Well, after a couple of weeks away from my chisels, I picked them up today and noticed that they've got some rust marks on them - and this is Brisbane! Rust must be even more of an issue for some of the wetter climates. This was right after removing the rust from the table of my second hand planer/thicknesser. Today must be the day for rust...
I've mostly been wiping down my tools using a WD40 drenched rag after using them (as recommended by Christopher Schwarz on his blog), but have been a bit slack about it. The WD40 rag method would be a bit of a pain in the ass as far as planes go - removing the irons and wiping down after every use.
I'm curious to hear what other forumites do to care for their hand tools - how do you keep them rust-free?