Leopard update for TagBot yet to come
Big Robot Software has posted a notice that while TagBot is mostly compatible with Leopard, showing tagged files does not yet function. If you’ve upgraded to Leopard, you’ll still be able to use TagBot to apply and import tags, but until Big Robot is able to release a full bug fix, double clicking a tag in the list will be pretty pointless.
They point out that the incompatibility has no harmful side effects, so you can continue to use TagBot with impunity; you’ll just need to browse your tags some other way (for instance, through the much speedier Spotlight).