In my Coronado 41's keelbolt area I have a lot of narrow channels that trap shallow pools of water. I hate having water around the keelbolts and mast step!
I installed a movable maintenance pump as sailingdog described so I can move it to the 5 different channels and suck up what i can ever week or so.
But the best thing I've found to keep that last quarter inch of water at bay are a half dozen of those cheap wishbone car washing sponges. Just have to wring them out into a bucket once in a while. I wonder if I could combine a cheap bilge pump and a sponge somehow.... hrmmmm
A permanently installed shopvac with a long hose might do the trick, but that would be pretty wonky