"Here here" gets about 70% more hits than "hear hear", but both seem to have a lot of irrelevant hits from a glance at the results. (Subtracting "and here" and "here here here" doesn't make much difference.)

The other ones I thought of (millenium, supercede, propogate, lead as pptc. of "to lead") have more hits for the standard variants, though sometimes the difference is not huge.

'Hear Hear' was the one that occurred to me, too.