Doh - I should have paid closer attention to Tailorbirds when I went in 2009.

A bit like Wrens they tend to skulk in the undergrowth and flit about, so it's hard getting decent views of them.

Cambodian tailorbird, or orthotomus chaktomuk

Quite amazing for a previously undescribed bird to be found in such a heavily populated city:

http://uk.news.yahoo.com/flame-headed-bird-species-found-cambodia-capital-000612077.html?vp=1#ErrgtKE