I was looking around for a nifty way of examining load issues on clients sites. I wanted some way of quickly pin pointing which images/files were causing the issue (or the delay was even being caused by site file sizes in the first place!). I discovered a cool little site called Pingdom that did the job.
Simply enter a URL and even check the save URL box. Pingdom drills down through your file load times and display in KB each different component of the page. It also gives you an outline summary of basic info about the site, how many images, style sheets, plugin, redirects, external objects etc. Simple and neat it does what I needed!
But Pingdom is more than just that, it is also an uptime and performance monitoring system. The system lets you know if you site has gone down, gives you uptime reports, response time reports and connects nicely to Twitter, SMS and Email to alert you if troubles a-brewing.