Being that most traveller's are based in the CBD area here are some great places to eat.

 Yum Cha Lover's:

• The Palace in Piccadilly Center on Pitt St opposite the Hilton Hotel. Excellent Yum Cha and also good Al a carte dining.
• Sky Garden in Sky Garden in Pitt St Mall area.
• East Ocean Restuarant at Chinatown

Food Courts:

• Sydney Central Plaza in Pitt St Mall area.
• Australia Square on George St opposite Wynard station.
• Met Centre on George St above Wynard station.
• David Jones food-court.

Cafes/restaurants:

• Some nice small cafes in The Strand Arcade in Pitt St Mall area.
• Customs House at Circular Quay on Loftus St.
• Cafe Sydney - expensive but known for its view from the top floor of Customs House at Circular Quay.
• Bacia at Cockle Bay opposite Darling Harbour.
• The Meat & Wine co Darling Harbour next to IMAX.
• Cupcakes on Pitt - Excellent, delicious, to-die-for cupcakes. http://www.cupcakesonline.com.au
• Tsukasa - Japanese. 200 Crown St, Darlinghurst

A good website to check out is http://www.eatability.com.au/au/sydney