Google robots.txt generator tool:
Do you want official Google robots.txt generator tool? Google adds that new feature on Google webmaster central.
check your webmaster tools account,
Dashboard > Tools > Generate robots.txt - Here's what it looks like:
iGoogle Webmaster tools Gadgets:
Google Webmaster Tools from your own homepage. Get errors, statistics, details about your site, and more on iGoogle.
check here, Dashboard > Tools > Gadgets - Here's what it looks like: