Motivations for PostgreSQL

I have a customer who is beginning to give more attention to the applications we host for them.  They recently asked
whatdatabase we use and I told them PostgreSQL.  They had never heard of it and really like Micro$oft SQL Server.  I
explainedto them the added cost and how PostgreSQL is a solid database but I need more to convince them. <br /><br
/>Whatare some good resources online that discuss PostgreSQL and how it compares to the "more popular" databases? 
Whileit really should be none of my customers' business what database I use (I am an application service provider),
theystill make a big deal out of it. <br /><br />Thanks!<br clear="all" /><br />-- <br
/>==================================================================<br/>   Aaron Bono<br />   Aranya Software
Technologies,Inc.<br />   <a href="http://www.aranya.com">http://www.aranya.com </a><br />   <a
href="http://codeelixir.com">http://codeelixir.com</a><br
/>==================================================================