we are in the process of migrating windows operating systems and to make future search easier in AD I'd like to put in more details into the description box in the computer name dialog.
e.g.
Blade03|BL465c|WIN2008R2|4GB|2CPU|75GB|10.67.41.53
I searched this on my AD and nothing comes up, is there an easier way to do this, so the description becomes searchable.
Your problem is that the description stored in the "computer name dialogue box" (System Properties dialogue) is different than the computer object's description attribute in Active Directory.
Typically, you'd use Active Directory Users and Computer (ADUC) or a script to update the description attribute in Active Directory, and not worry about setting the description on the local machine, because as you observed, the local machine description isn't searchable in AD, and therefore of limited utility.
System Properties description field:
Active Directory description attribute:
(I guess you'll just have to take my word that these are for the same machine.)
I find the easiest way to search AD is with PowerShell. If you're on a client OS, install RSAT (it's different for each OS or I'd link you). Make sure the feature is enabled: Remote Server Administration Tools -> Role Administration -> AD DS and AD LDS Tools -> Active Directory Module for Windows PowerShell.
Then just open PowerShell and do something like