You can use FlashFXP with wine with pretty good results.
I've used FlashFXP/wine, but now I use IglooFTP
with runs on linux. Its closed source and costs $$ to register past the trial date (30 days I believe), so the open source purists (which I call the linux Nazis usually) will protest. Ya, I'd prefer a FREE and/or open source application, but as there isn't anything thats seems to close (gftp isn't that close), you gotta go with what works.