How can I time my startups and see what processes are taking the longest?

I want to be able to profile my startups and see how long each program takes to startup. I'm running windows 7.

Soluto does exactly what you are looking for.

Soluto Beta allows you to understand your boot, discover which applications are slowing it down (and keep running later in the background, affecting your ongoing experience), and allows you to significantly improve it. While Soluto Beta focuses on the boot, it already researches for frustrations and helps map the PC Genome, and allows you to share your wisdom with others.

Screenshots taken from the lifehacker article.

If you are talking about startups that load when you boot the PC, see the link below, it was written for Vista but applies to W7 as well. There is a lot of info logged by W7.

ZDNet - Microsoft's hidden diagnostic tool unlocks Vista startup secrets