I've got a Dan Wesson .357 revolver that I quite enjoy shooting. In general, I prefer modern stuff, but something about the simplicity and elegance of a revolver appeals to me, and I've found that the trigger in particular is much more comfortable and easier to use than on semi-auto handguns. I'm currently in the market for an FNP to get my concealed carry permit, because the FNPs grips are quite comfortable and the DA/SA trigger is more similar to my .357 than other options and I'm more at-ease with semi-autos that have a manual safety.
I've also been considering either a Kel-Tec RFB or an FN-FAL when I graduate, I know a guy with an FAL part kit willing to sell it to me cheap, but I'm just not sure how practical owning a meter long rifle is, my friend has a much shorter AR-15 and has plenty of trouble transporting it to the range and back, so the even shorter RFB may be worth the extra cost just for the convenience.
And, somewhere down the road, I'll probably get a shotgun, likely a mossberg, for home defense and sport shooting.
As far as geeks and guns, it seems like lots of 'gun-nuts' have very similar personalities to most 'geeks' just focused in different areas, it just seems natural to me that the two would be related, and 'traditional' geek fare such as computers share a lot of features with firearms from a historical perspective, entrepreneurial engineers establishing corporate empires, clever 'hacks' becoming accepted solutions, brands with extremely loyal followings etc.
And, like computer games, recreational shooting is lots of fun. Also, going out to the shooting range is a great way to spend time with friends outdoors and without dice, so probably something lots of geeks should look into