here are a few unwanted behaviours or missing features,
I am using google chrome (latest beta) and WP3.0-beta2
1) you are not able to edit the description of a field once it was created.
2) When inserting for the first time values for select boxes, and probably other elements, While it´s nice to have the "click here to add a comma separated list of values... (hit enter to save)" message explaining how it works, I dont think it should be there in the input box when you click on it,.. as I have to select everything and hit delete.
3) This is not a bug: when choosing a "field name" I chose something_like_this, i think it should be clear that this will be converted, or maybe set up a title box. i know it is one more field, but it was not clear to me that field name will becmoe title, and the actual field name will be converted from this field. i thoght Description was the TITLE of the field.
That´s it for now, i will try to contribute with more ideas as i get used to this plugin