Well...I came across this Dundas Gauge XML Template while researching an installation issue on a recent proof of concept.  In a nutshell, if you are creating "Bullet Charts" for a dashboard type report within Reporting Services, and you're using Dundas Guage controls, then you'll want to download a free XML Template that allows you to create the Bullet Chart easier.  Here's the Dundas article I came across: http://support.dundas.com/Default.aspx?article=1122.