Is there a website to see what is safe/unsafe to check in Autoruns?

The Running Tasks tab on free Startup Delayer shows the precise load time of a startup, thus you can see from the load time of a NEXT startup (by simple subtraction) when a particular startup has taken an untoward amount of time.

As to blackviper and "safe to disable" services, those are only "safe to disable" if nothing on your PC needs them, and it is sometimes VERY difficult (or impossible) to identify when a particular program needs a particular service. And by the time you have a problem and are trying to track-down the cause of it, you have forgotten what-services-you-disabled-when, and-why. IMO Windows 7 has got all the services so well-tuned (they only impact your PC when they are needed) that one should not touch them (again, unless you know why you are touching them e.g. I don't use Homegroup and have the two HG services disabled). But certainly, blindly disabling services according the the BV site is never a good idea, whether for W7 or XP or...

You are absolutely correct. I'm going from several Windows developers on this one, but a default service isn't actually running or taking up resources, unless it is in use or called upon by some other application. Therefore, unless it is being used, it isn't taking up any resources...so disabling it gives you nothing. Because of dependencies, you never are 100% certain a service won't be used. If one is needed, and it's been disabled...you have an issue.