The Economist - required reading for global economic news and opinion.
Prospect - Excellent array of current affairs articles, all of which are thought-provoking.
Private Eye - Long-standing satirical magazine aimed squarely at the UK establishment.
Wired - Seemed a good idea at the time, not sure how much value I get from it. Probably won't renew next year.
New Scientist - interesting read for an armchair science geek, but even I'm wondering if it is dumbing-down ever so slightly these days. 50/50 chance of renewing next year.
I also get regular access to Harvard Business Review as a business school alumnus, which is always worth a read, even if it is just a reminder as to why I took my MBA and said goodbye to corporate life :)