Just getting started with linux and trying to take advantage of dated older notebook running xbuntu 12.04 beta. Is there a better choice from an OS point of view, earlier version perhaps or just continue to move forward slowly. I've surprized myself and have already struggled through some HW issues using the CLI. Any suggested links would be greatly appreciated.

The problem with using an older version of any distribution will be the lack of support, no updates available.
Usually with older machines the primary problems are limited RAM and graphics card support.
What is best depends also on what you will use the OS for. You can usually get information on minimum hardware requirements for any distribution by doing a web search, at least for the more popular distributions.

Some distributions which run well on older machines are Slitaz, Puppy, and AntiX. Have you googled Linux on older hardware? That would be a good place to start while you are waiting for responses here.

What are the hardware specs of your computer?

Xubuntu Beta is probably going to be a little buggy (final release is about a month away). If you enjoy using the latest software and can handle a little instability, then go for it!

I'll say keep your Beta installation and once it become Official you will get all the updates through the updates manager in Ubuntu. By then (in a month) many bugs are going to be fixed.

I am using 10.04 at the moment, my PC is old and I dont think I have the video card required to run Unity so I dont know what is going to happen.
I have installed Enlightenment 16 just in case I need a plan B after the upgrade.

Good luck to you.

A beta-test version is for hobbyists to try out, not for beginners to learn on.

The limiting factor on old computers is usually memory. Xubuntu needs 512MB for comfort. If you've only got 256, try Salix, Vector Standard, or Lubuntu. On 128MB, try Vector Light or AntiX.