Seems really advanced - met her for the first time today and she can clap, crawl, cruise really well, wave, she can pat her head when her mum said "can you pat your head?" (Ie, not by showing her), she said "all done" (well ah dun, but it was obvious what she said), as well as (I'm pretty sure) "down" "oh dear" (ah dee) and "clap".
I don't remember my DS being able to do all this (although he could crusie, wave and crawl like a demon!) - do you reckon this is advanced for an 8mo? My friend didn't seem to think it was that unusual.