You already know about ffffound.com. Yes it’s one of the best design sites in the world, but it has huge flaws, like no search capability or tags (basically everything you take for granted on a modern website).
Well now meet Designspiration.net by wanken. It doesn’t have ffffound’s random weird images but it does have a huge advantage in search functionality. You can even search by combined colors. I just hope someone makes an iPad/iPhone app worthy of the website.