Well today when i started up looking at webmasters tool s service centre of google there was Google survey for all the webmasters.They are asking about how good their service is helping webmasters.
I think Google Webmasters Tool is helpful, See how your site is performing, how Google crawls and indexes your site, help Google crawls your site better, ...
GWT is simple & quite helpful. Witha recent features called content Analysis, webmasters could easily know what could be problem in terms of content in their website. Also link Analysis is a gret tool. I regularly update a excel sheet with details from GWT which helps me to identfy any updates in Google.
it's helpful but i think knowing about google penalties with the help of google webmaster tools can be a nice feature
I just completed the survey few minutes ago. Google webmaster tools is great but I wish they update back links etc a little more often
I have to agree that the tools there are helpful especially the anchor links and the list of search terms that bring you the traffic