Places to eat in Cambridge?

[strange_raptors]

From this evening until Friday afternoon I'm at a conference in Cambridge. Breakfasts and lunches are provided, but dinners are not which leaves me in the (simultaneously enviable and unenviable) position of having to find places to eat. This is where you can help! I am looking for cheap (less than £10) places which do good food and are reasonably central (though I don't mind a walk if it's to somewhere good). I don't mind takeaway places, since Cambridge is quite pretty.