Yeah, I forgot the
Autocomplete, absolutely can't live without.
The drag and drop that I just implemented is neat as well but as you kindly helped and sharply observed, just confusing,
I kind of skip Tooltips, that is, when an application is used by users who are knowledgeable about the subject matter, and when the UI is easy, no instructional help seems necessary and when it's absolutely necessary to provide some instruction, I just put them at the top, very obvious = very easy to spot.
As for tabs, in my experience, many users can't like tabs they feel going places... so, I try not to use them whenever possible.
Regarding accordion, I played with it before but never implemented to any app that wrote.
Thanks.