Thanks for the info guys. Next starter, I'll do a gravity test on it to see what's happening there. I usually mix about 3 oz. DME with 1 Q water, boil 15 min., cool, and pitch yeast. So far I have yet to use the same type of yeast twice, though they have all been either Wyeast or White Labs liquid.
My latest batch is a Tripel which went from 1.082 to 1.014 after 2 weeks in the primary. Unfortunately I forgot to write down the type of yeast, and my wife was a little to efficient cleaning the kitchen that day. So this one's a mystery beer.
As far as aeration, I pour the wort through a strainer into the primary (plastic bucket) with the yeast slurry already in the bottom. If there doesn't seem to be enough foam on the top after this, I will stir it up a bit with a spoon. Other than that, I haven't paid much attention to aerating the wort.