My very first PDA was in 2002. Its the Sony Clié PEG-SJ20. Its a 320 x 320 monochrome stylus based PDA running on Palm OS4.1 and it had a whopping 16MB memory. After using it for about a year or two, I lost it. I believe I dropped it in a cab and had to replace it.
Then came the Sony Clié PEG-SJ22 (which i still have now & am charging it as i’m typing this). Its very much like the SJ20 but with colour. Yes, a whopping 16MB ram as well.
Then came the era where phones were PDA too a few years later.
I bought the Dopod 818 Pro. That was one buggy phone with Windows Mobile and all, but I still managed to use it for 2 years.
My contract was up and I got the HTC Touch. I liked the smart phone a lot and used it heavily. 20 months went past and I upgraded again.
The concept of the PDA was out side of the phone, it moved into the phone, now its moving out of the phone again.
Now I haz iPad. And this post was typed partially on my iPad with the WordPress App. ;)