We've filtered out all bots so you can see how human traffic dips on the weekends. You can also see a drop around Christmas. There are two big jumps where Paul Graham mentioned us in an essay and where we released search filters. Right now we are getting 110K unique ips per month and our traffic is doubling every three months. It's a great feeling to know that people are finding us useful.
Seriously, thanks to everybody who has been using Octopart and sending us emails (contact@octopart.com). You're awesome!