Hopefully this should help you out:

http://sdk.episerver.com/

You find the API docs at http://sdk.episerver.com and the PageData class is a good place to start looking, along with the Developers Guide

Thanks guys. It looks like the online version of the file I downloaded, except that clicking on tree items actually opens then on the right-hand side ;-)

I don't suppose there's a tutorial on configuring an application to consume the web services of EPiServer?

Peter it all really depends on what you want to achieve. Can you be a bit more specific about consuming web services? EPiServer does offer some web services but generally the best approach is to access the API directly which pretty much gives you access to anything you need?

I have an existing app and I want to use a separate EPiServer installation as a content source. The two apps will be sitting on the same web server. 

Ah I see, in that case I'd suggest looking into content channels. These offer you a way to mirror content between EPiServer installations.

Admin Mode > Admin Tab > Tools > Content Channels

Here are some useful links which explain how to use them:

http://world.episerver.com/Blogs/Jeff-Wallace/Dates/2010/3/Pushing-Data-into-EPiServer-CMS-5-via-Content-Channels/

http://www.frederikvig.com/2010/05/episerver-developer-resources/#toc-content-channels

They are for EPiServer CMS 5 but things aren't too different in CMS 6 (assuming that is what you are using)

That looks like the reverse of what I want to do. I want to use EPiServer as a content source for a separate, non-EPiServer isntallation. It looks like those links are for pushing data into EPiServer?

Ah I thought you might want to push content from one EPiServer site to another. In that case I'd advise looking at the API directly then creating a WCF service that returns typed data for consumption in your other site.

If its only links you need then a RSS feed from EPiServer should do nicely along with a reference to:

http://msdn.microsoft.com/en-us/library/system.servicemodel.syndication.syndicationfeed.aspx

That could be just the ticket, cheers David!