On this page I've gathered some useful resources that you can use to get a feel for how your optimization efforts are going:
Pingdom Website Speed Test
While in parts less specific than Googles PageSpeed it is in many ways a much better representation of actual page speed. This should probably be your first stop when seeing how your doing.
Also allows you to test from several sites across the globe which is helpful.
CSS stats
Great way to check out how complicated your CSS actually is. Try to keep to a simplicity score as low as you possibly can.
Google PageSpeed
Googles own very good and very picky page performance tester, a must use if you are serious about performance. You can read more about it here
Hubspot Website Grader
Add "/results/url.to.your.site" in the URL to run it for your site without being pestered endlessly with emails from Hubspots marketing department. Hubspot does more than just check performance, but they have a simple and sane performance breakdown as well which is a good start. It is often the case that page response time is reported as higher than seen in a normal browser though.
Send an email to blog at andershammervald.com and I'll take a look.