Just got this little Sunpak flash. Works great, and the best part is it has a built in flash cord so it can be used with cameras without hotshoes like my S2, Leica M3 etc.
Of course it also has a dedicated terminal.
$10. Ebay. Like new.
It's nice because sometimes you just want to use a camera like this with a flash without having to deal with adapters etc.
Showing how the cord stores when not in use: