Here's a few of our dance floor fillers (UK biased).

Major problem for a pair of 40+ blokes is that a lot of the decent up-tempo stuff is sung by ladies.... but no-one seems to care!

Raining Men (Geri Halliwell version)
Man I Feel Like a Woman (Shania Twaine)
Dance The Night Away (Mavericks)
Dancing Queen (Abba)
My First, My Last, My Everything (Barry White)
Hey Baby (DJ Otzi Version)
December '63 (Four Seasons)
Night Fever (Bee Gees)
Staying Alive (Bee Gees)
Reach (S Club 7)
Tragedy (Steps version)
Chain Reaction (Diano Ross)
Crazy Little Thing Called Love (Queen)
Freedom (Wham)

And others dragged out less frequently)

Disco Inferno (Trammps)
Believe (Sher)
Gimme Gimme Gimme (Abba)
Don't Stop Movin (S Club 7)

Not forgetting the old standbys

I WIll SUrvive (Gloria Gaynor)
YMCA (Village People)
New York, New York (Sinatra)