Alias rendering

my renderings are good but they come out a little pixelated. how/what do i have to do in order to get them looking clean and what should i save em as. thanx for your replies

Try increasing your anti-alias settings in the Render Globals. You can either do this manually, or select from the Low, Med, High presets. I usually render out .als or .tif files, and then re-save with the desired levels of compression with jpg in photoshop.