I really know nothing about Amira Kheir. I was turned onto her by Omar, and I really like what she does. It's Sudanese music with a jazz inflection. Very tasteful.
Here's what Amira says about herself and her music on her myspace page:
I am Sudanese – Italian and I have lived in 3 continents through out my life – hence my music is a direct reflection of this multicultural legacy. The North of Sudan, being at the crossroads of Middle Eastern and East/Central African culture has a very particular and ancient musical tradition finding its roots in the Nubian civilisation of my ancestors.
Please give her a listen. Three songs are up as of today, on her myspace page.