Google Webmaster Central is an excellent resource for site owners and developers. A Google Groups thread asked if there is a way to give someone else access to your Google Webmaster Tools reports.
Why would someone want to do this? Let's say you are the site owner, and you want to show the reports to your SEO. There can be dozens of reasons.
Unlike with some of Google's other products, where you can invite people to see your data. Examples of products that allowed invite access include, Google AdWords, Google Analytics, Google Docs and others.
Currently Google said this feature is not available, but they know about the request and they are "considering it." But there is a work around. You can easily upload several verification Meta tags or HTML files. This allows you to give that user access to your reports. You just have that user try to authenticate your site in his Webmaster Tools section and him give you either the verification Meta tag or HTML file and add that to your site. Presto, multiple access to the same reports. I do this with a few sites.
Forum discussion at Google Groups.