Videogame sales became a hobby of mine shortly before the launch of the DS vs PSP. Prior to that, I was aware of the sales of different consoles, but it wasn't something I checked up on weekly or anything like that.
It's hard to say when I first started coming here. I came here primarily for sales data and didn't participate in the forum for a long time. I should have another account named "NFreak" or something like that, but I lost the credentials awhile back as it was tied to my university email, I reckon. I remember it being called vgcharts.org.
Before coming here I used to go to a different sales site at a forum from pcvsconsole.com (forum has been gone for awhile, but recently the site must have disappeared too, as I can't find it). During the launch of the DS vs PSP was when I began getting more involved and posting there. I still have people on PSN and Steam that I met on that site.
There was also another site that came out before the Wii launch that had a real-time live counter of sales, where you could just watch the numbers tick up in real time (gimmicky).
Talk to TruckOSaurus about that (he posted here).