I wouldn't say I'm an expert, just pretty good at this computer stuff.
I know delphi, learning more all the time. C++, C#, windows, Citrix, Linux.
I'll give anything a go though it's always good to learn new stuff.
I'm now Citrix and Microsoft qualified, and have the opportunity of working on very large networks in my job.

I've written a few useful things over the years, they are at http://dev.lustyd.co.uk