Here's mine - the player, target, and targettarget unitframes are pitbull, the raidframes are the only remnants of Xperl that are left over - I leave almost everything to remain transparent when not in group or raid. Meters are Recount, Omen for threat, bars are dominoes, 1 bar worth of fubar, ElkBuffbars, Cowtip for tooltips - ARCHud, SCT, SimpleMiniMap, Mini Map Button Bag (I think), Cartographer, Clearfont2 for fonts.

The Player and Target frames have been thinned since this SS was taken.

Even with all that the memory usage is really low - I'm real picky about what I have enabled and don't.