Ouch! I obviously changed too much for people :(
I have just submitted an update with the separate toolbar button back in for those that prefer it. It should be available for download soon.
Please let me know exactly what else you would like changed. Email eurekaman at gmail for better response times. Thank you all for the feedback.
HOW TO TOGGLE (in Firefox 2)
In the FF 2.0 version there is no toggle button to put in the toolbar (yet!), but the searchbox is now tiny rather than invisible. You can make it expand by clicking on the search button within the searchbar, or tabbing to the searchbar, or using the accelerator key (ctrl-K on some platforms), or selecting a new search engine in the dropdown within the searchbar. Please let me know if any of this isn't working.