What are you planning to do with it?
Watch videos? Play games? Do spreadsheets?
What price range are you looking for?
Size, weight, heat? Any of these matter to you?
You can't just come in and say "recommend older laptop" without at least some qualifying information.
If you just want something lightweight to browse the web and type on in the $200 range, get an Asus EEE pc or some other flavor of Atom netbook.
If you want a beefier machine that will play some more modern games, but is heavier, larger, and hotter for the same price range, look into an old refurbished IBM W510. Corporations bought those by the palette load and they're showing up on ebay dimes for dollars and still work/look great.