Now and then I see people refer to using monitoring services to keep an eye on their sites. This has never really been a concern of mine since I tend to watch my logs and commissions, etc. enough that I KNOW if there is a problem. That said, I can imagine a time when my site count gets high enough that this would not be the best approach.

So... A few questions for those of you further along the curve than me...

- What monitoring service do you recommend/discommend?
- What features do you like/find useful/useless?
- Does your service just alert you of downtime or does it give you periodic reports, etc.?

And anything else you'd like to offer would be wonderful too. Thanks so much!