From your question, it sounds like you are saying that your cat is acting pretty much normal, other than the excessive drooling.  How long has this drooling been going on?  Is it constant or is it periodic?

Excessive drooling in a cat is usually caused by anything that stimulates the part of the nervous system that controls the salivary glands, anything irritating in the mouth (such as a foreign body or a growth of some type), and certain types of poisons (even flea and tick products can do this). 

If this just happens just 1 time and goes away, your cat will probably be OK.  but, if it keeps up or comes back soon, you should have your cat examined by your veterinarian.

Helpful Buckeye

Sorry to be so slow responding here. In addition to the above, cats will also drool for behavioral reasons and this can be caused by opposite emotions. Some cats will drool a great deal when when scared. These cats will hunker down and their pupils will often be dilated/big. Some may also hold their bodies stiff and tremble.

Other cats will drool when they're comfortable. These animals often will drool as they purr and knead their owners or a blanket or toy. Some also will suck the owner's clothing, blanket or toy at this time. My take on it is that these animals were weaned too young and they do this to comfort themselves. I say this because if the owner doesn't punish the cat but provides something the animal can use in this manner safely, most of them outgrow it. If the owner yells at or hits the cat, the confused animal may start sucking frantically or even chewing in an attempt to comfort him/herself.

What does "weaned too young" mean? It depends on the kitten. :-) There's a growing belief that placing kittens at 8 weeks is too young because animals nurse for behavioral as well as nutritional reasons. The more young animals have to learn, the longer they need to stay with their moms,  and nursing plays role in keeping the young in the learning mode as well as providing comfort.  In studies of cats in complex environments, such as barn cats,  queens (i.e., mother cats) may not wean their kittens until 12-18 months of age for a lot of other very good reasons. And sometimes living in human households are a lot more complex than living in a barn. :-)

So if your veterinarian rules out any medical problem, there might be a behavioral explanation.