My safari setup is 5 windows on screen
window one top left Tech websites and blogs about 25+ tabs open
Window 2 middle left News and politics sites and blogs 25+ tabs open
window 3 bottom left Online bank website.
Window 4 Top right Boinc project websites and other misc websites around 20 open at any one time.
Window 5 Alaska volcano eruption of MT Redoubt webcams other volcano webcams(Hawaii)
In the beta 4.0 you could croup the tabs in the list and then switch around the list using the >> symbol at the end of the tab list. all the tabs would switch to a group around the tab you selected. this way I could move from one set of blogs on one topic to a set showing news sites to then move the set showing to just those blogs. the tech window 1 would have tabs grouped as favorites followed by blogs followed by review sites I could move the tabs shown to have one group showing at a time making it easy to switch back and forth in the group now the >> symbol only changes the last tab showing. So now if I want to group tabs together I need to double or more the number of open windows. this sucks big time. The >> symbol behavior has reverted to safari 3.0.
*WHOOSH*