Google went from having a great search engine that had some obvious ads, to having a search engine that is designed to deliver adverts over good results.
Froogle was a great way to find products from any online store, they scrapped that and made people pay to have their products listed.
I’m sure it’s making them loads of money at the expense of user experience, but a competent search engine will eat their lunch, just like they did against Yahoo and Ask Jeeves. Hopefully soon.