If you leave the cluttered UI, OxyShopping is actually a good meta engine implementation that collects data from various sites.
Products are classified under relevant categories like Mobile, Clothes, Computer etc and buying process happens at the original site.
Though OxyShopping has a long way to go in terms of building a usable UI (for e.g. ability to sort results based on price, de-cluttering etc), OxyShopping is a good stuff and does fill a gap.
What’s your opinion?