You may be able to accomplish this by using sub-domains. For example:
my-sso-app.appspot.com
blog.my-sso-app.appspot.com
forum.my-sso-app.appspot.com
I'm not 100% sure but I believe you can share data, and authentication between 
apps in the same domain. 

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-----Original Message-----
From: "Ikai L (Google)" <[email protected]>
Date: Mon, 26 Apr 2010 11:33:10 
To: <[email protected]>
Subject: Re: [appengine-java] Single Sign on between applications

Not natively. You may want to look into doing something with OpenID, which
may make the process a bit less bothersome, but won't remove the need to
login completely.

On Sat, Apr 24, 2010 at 11:51 AM, terran <[email protected]> wrote:

> Was trying to look around for an answer and couldn't find it, but if I
> owned several applications, could i create a single sign on page that
> would log into both applications at the same time? For example, if i
> had a blog type of web site and I wanted to integrate it with a forum
> application I had, could I sign into both with 1 screen?
>
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-- 
Ikai Lan
Developer Relations, Google App Engine
Twitter: http://twitter.com/ikai
Delicious: http://delicious.com/ikailan

----------------
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