Hits, uniques, clicks, impressions, page views, Google page rank ... but the measure you'll never see in any web logs ... leads.
How many leads is your site generating? That's what matters.
Of course traffic is important. If nobody sees your site, then nobody is going to call. But you can waste plenty of time building a site and even paying for traffic -- and still get nothing.
Here's an example: reexpert.org
It appears they recently started an ad campaign because their traffic rank suddenly jumped (COMPETE.COM), but if you view their home page, it still says (and blinking no less) "Sorry, this page is under construction" They didn't even finish the About Us or Contact Us sections! (TIP: Never put apologies for undone pages on your website. If something isn't done, don't publish it)
I don't know who they are and I don't mean to be picking on them, but this is exactly what you don't want to do. Load your site full of meaningful content and do it one day at a time. Take the ActiveRain approach and start awarding yourself points for building YOUR domain.