If you want to filter and customize the search results you see, use the options along the side of the results page. For example, you can choose to just see blogs updated within the last 24 hours or photos of a certain size. Google has merged all the group options from the search, and now only kept the group that lets you restrict the results to recent web pages. Google also removed the "related searches" view which showed a list of related searches at the top of the page and allowed you to compare the results for different searches.
"Based on your search and the Google property you've selected, you'll see a customized list of filtering tools. We'll automatically show you the tools that seem most relevant to your search, so you won't always see all of these tools," explains Google. To display all the filters, click "more search tools".
Here's a screenshot that shows some of the old sections:
[tags]search results,search page,search sidebar[/tags]