[ggruschow]

... Why do algorithmic trading articles pop up frequently on HN?

Making money with algorithms is interesting to people interested in algorithms and making money.

... you still can't beat the street because: speed and volume

You mean you can't, and since you believe you can't, you're right.

... Can an individual's machine setup handle real-time analysis of a basket of stocks and general market condition from multiple market centers?

Yes. I don't know why you think it's so hard. Sure it requires work and some skill, but at least hundreds of people have done it. I have, and I don't have an advanced degree in computer science, finance, or magic.