What other brands of flash can i use that can be triggered from my nikon d80?

I'm looking around for flashes that can be triggered remotely from my nikon d80.

A couple of possibilities:

Sigma EF-610 DG SUPER
Metz 58 AF-2

There are also others that can be triggered wirelessly, either from Commander mode or the older SU-4 mode, but this should get you started.

You can consider Nikon SB-600 Speedlight Flash for Nikon Digital SLR Cameras

Easy-to-view LCD with 6 simple-to-understand backlit buttons
FV lock holds flash value, enabling recomposition prior to shooting
Accurate i-TTL flash control achieved through flash exposure monitoring control
Ready light located beside the LCD on the back panel - highly visible even when used as a remote
Auto zoom of 24 to 85mm, extendable to 14mm with built-in wide-flash adapter