Diffusers....I learnt something, a neat trick this week. ( I learn a new thing everyday )
Use a frosted white shower curtain ( leave the floral ones for the shower or the skip - which ever applies )
and attach to your chosen well lit or over lit window to get a great diffused light for an indoor shot.
Especially handy if your looking to use the window as side lighting...make sure your a small distance away and shooooooot!