Google has updated Google Webmaster Tools to add new dashboards, updated the navigation and added a compact view for the home page site-list.

The dashboard is what you see when you go to a site profile. On this view, you are able to see crawl errors, search queries and sitemaps indexing graphs right there:

Google also updated the navigation on the left hand side, here is the new navigation:

Dashboard
Messages
Configuration

Settings
Sitelinks
URL Parameters
Change of Address

Health

Crawl Errors
Crawl Stats
Blocked URLs
Fetch as Google
Malware

Traffic

Search Queries
Links to Your Site
Internal Links
+1 Reports

Optimization

Sitemaps
Remove URLs
HTML Improvements
Content Keywords
Other Resources

Labs

Custom Search
Instant Previews
Site performance

Google explains each category as follows:

Configuration: Things you configure and generally don’t change very often.
Health: Where you look to make sure things are OK.
Traffic: Where you go to understand how your site is doing in Google search, who’s linking to you; where you can explore the data about your site.
Optimization: Where you can find ideas to enhance your site, which enables us to better understand and represent your site in Search and other services.

I like.

Forum discussion at Google Webmaster Help.