First, I like the new AJAXified cart block.. nice! But it seems one of the other features I liked best about the previous versions of Ajax Cart, is that it had a very low profile to the end user. The LightBox2 type notifications and the Growl Window messages really intrude on the user.
I would like to see a third status notification added back in, the original type where the Add to Cart buttom would cycle until the product was added to the cart. This was great, in that the customer knew what was going on, without sections of their screen going into fits.