One more tool i've found useful in addition to what rich listed: an antenna off an old broken radio. It can be used to prod spiders like what you'd use the paint brush for or just rearrange stuff in the enclosures. The reason why i like it is because its an antenna so the length is adjustable. When i'm doing stuff in the smaller cups i make it shorter and in bigger enclosures just make it longer.
Yea rich i'm gunna transfer my obt to a smaller cube. Not sure if i wanna give him a more arboreal or more burrowing setup... I really like the tunnel my meridionalis has made in her cube. I need more ceratogyrus!