There is a completely programmatic way to access the data using greqo(PHP), but the analytics class is in beta. Check it out here.
If beta is not acceptable, you can use a mixture of the XML and Yahoo Pipes to get what you need.
Basic Method
Obtain the tracking data in a usable
format – We can schedule Google
Analytics to email this as an XML file
on a regular basis.
Make the XML file accessible online –
By emailing an attachment to Google
Groups, the file is automatically
given a public URL.
Work out the URL of the most recent
report – Since Google Groups provides
RSS/Atom feeds for all messages, we
can easily find the URL of the most
recent message and therefore work out
the URL of the XML report.
Prepare the data for use – We need to
manipulate the XML and massage it into
a handy JSON format that we can use on
our blog, which can all be done using
Yahoo Pipes.
Taken from here.