If you want to talk about first to introduce the tech
1. First 3G network was in Japan in 2001. By 2002 3G there were commercially available 3G phones.
2. MBA (introduced 2008) vs. Sony Vaio X505 (introduced 2004)
$3,999 for carbon fiber edition. Never really took off with that price/performance plus ergonomic issues.
http://www.mobiletechreview.com/notebooks/sony_vaio_X505.htm
10.4" screen, .38" to .8" thick, 1.73 lbs
3. iPad - PC tablets has been around for quite sometime before iPad. Some are even pressure sensitive. Tech was mature, just no one thought of putting it in a package like the iPad. Everyone was thinking stylus + tablet. HP had a "touch" PC but don't think that did well.
Others were first to market but not been able to "get it right" (i.e. you don't read about it in the newspapers). You do not hear about these because they all flopped or were all primitive at the time.
Apple is always good at picking the right time to join the party, have a plan, vision and joined with a much more complete package (user experience as they call it).