Here's my track record:
CD Player - January 1985 (my birthday). Top 0.05% of CD player adopters. By the end of 1984 there were 340,000 players sold in the US. By the end of 1985, they had sold a total of 1 million. By 2000, there were over 150 million.
The CD Player was introduced to the US in March of 1983. the Sony CDP-101 (it cost about a grand. They sold very few). I bought a Technics SLP-3 for $599 (very expensive back in 1985!) in the beginning of 1985.
DVD Player - June 1998. I purchased Blade Runner - Directors Cut same day. Top 1.1%. By the end of 1998, there were 1.4 million DVD players sold. In December of 2007, there were nearly 132 million.
eBay - May 28, 1999. Top 1.4%. By the end of 1999, there were 3.8 million registered users. By the end of 2007, there were over 276 million registered users.
Netflix - October 10th, 2000. Top 1.6%. By the end of 2000, Netflix had 239,000 subscribers. In 2010 they have over 15 million.
Apple iPod - July 2004. Top 3.6%. By the end of 2004, Apple had sold a total of 10 million iPods. By September 2010, they are over 275 million.
I bought the first HP+iPod offering. 40Gig hard drive. It was actually the 4th generation iPod (I know, slacker!), but to be fair, this was the first iPod that had access to a Windows version of iTunes software and store. So, really, I'm giving myself a first gen pat on the back!
Apple iPhone - June 27, 2007. Top 0.45%. I bought the iPhone the first day it came out. June 27th. 2007. Apple sold 270,000 that day! By the end of September 2010, Apple had sold over 60 million iPhones.