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Start here:<br />
Really general overview:<br />
<a href="http://en.wikipedia.org/wiki/[CalDAV](CalDAV)">http://en.wikipedia.org/wiki/[CalDAV](CalDAV)</a>

This is a good overview of the specifications:<br />
<a href="http://caldav.calconnect.org/standards.html">http://caldav.calconnect.org/standards.html</a>

Here are some of the standards we'll be implementing.  Note that several of these documents are referenced in our target spec:<br />
<a href="http://www.ietf.org/rfc/rfc3253.txt">http://www.ietf.org/rfc/rfc3253.txt</a><br />
<a href="http://www.ietf.org/rfc/rfc3744.txt">http://www.ietf.org/rfc/rfc3744.txt</a><br />
<a href="http://www.ietf.org/rfc/rfc4791.txt">http://www.ietf.org/rfc/rfc4791.txt</a><br />
<a href="http://www.ietf.org/rfc/rfc4918.txt">http://www.ietf.org/rfc/rfc4918.txt</a><br />
<a href="http://tools.ietf.org/html/draft-desruisseaux-caldav-sched-03">http://tools.ietf.org/html/draft-desruisseaux-caldav-sched-03</a>

Overview of the specification dependencies and documents:<br />
<a href="http://www.rooftopsolutions.nl/article/227">http://www.rooftopsolutions.nl/article/227</a>

Google's instructions on using Sunbird (free/open source calendar software that supports CalDAV as a client) with Google Calendar:<br />
<a href="http://www.google.com/support/calendar/bin/answer.py?answer=99355">http://www.google.com/support/calendar/bin/answer.py?answer=99355</a>

This is a document that outlines the coding standards that will be in effect on all software we write:<br />
<a href="http://wiki.horde.org/Horde4/[CodingStandards](CodingStandards)">http://wiki.horde.org/Horde4/[CodingStandards](CodingStandards)</a>

Code resources for CalDAV and GroupDAV:<br />
caldav:<br />
<a href="http://rscds.sourceforge.net/">http://rscds.sourceforge.net/</a><br />
<a href="http://rscds.sourceforge.net/clients.php">http://rscds.sourceforge.net/clients.php</a><br />
<a href="http://wiki.zimbra.com/index.php?title=CalDAV\_with\_Leopard\_iCal">http://wiki.zimbra.com/index.php?title=CalDAV\textbackslash\{\}\_with\textbackslash\{\}\_Leopard\textbackslash\{\}\_iCal</a><br />
<a href="http://www.rooftopsolutions.nl/article/232">http://www.rooftopsolutions.nl/article/232</a>

groupdav:<br />
<a href="http://www.egroupware.org/index.php?page\_name=wiki\&amp;wikipage=[GroupDAV](GroupDAV)">http://www.egroupware.org/index.php?page\textbackslash\{\}\_name=wiki\textbackslash\{\}\&wikipage=[GroupDAV](GroupDAV)</a><br />
<a href="http://www.nabble.com/GroupDAV-and-IcalSrv-1.4.003-td15045378s3741.html">http://www.nabble.com/GroupDAV-and-IcalSrv-1.4.003-td15045378s3741.html</a>

<a href="https://wiki.horde.org/DavMail">DavMail</a>: (<a href="https://wiki.horde.org/CalDav">CalDav</a> Gateway with <a href="http://www.internex.at/de/hosted-exchange/">Exchange</a>)<br />
<a href="http://davmail.sourceforge.net">http://davmail.sourceforge.net</a>

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