These are the websites I visit fairly regularly, which you may find useful as well.
My daily go-to place to find out what is going on in the wider world of quant
Not really quant, but the best statistics site on the internet.
Website of fellow quant and pythonista Saeed Amen
There might be more credible "Learn to be a quant" websites out there, but I haven't found one
The largest message board for traders on the internet. Inevitably a lot of nonsense, but also some fine posters and interesting threads.
Keep track of your trading performance.
FT alphaville, particularly the daily markets live, is a great insight into what is going on; amusing and saves you from having to read a lot of pointless and boring dross. And its outside the pay wall; thats the pay wall of the worlds most expensive newspaper subscription. Most of which is probably spent on the weekly glossy "How to Spend it" supplement: think Argos catalogue with more zeros.
For your right wing views you could read the telegraph of course but its business stuff is also behind a pay wall and the only two reasons to buy that rag are the crossword on Saturday and Alex which you can get for free.
If you read the FT you have to read the Guardian to compensate or you will end up clubbing baby seals to death in the name of economic freedom.
Matt Levine is my favourite BB correspondent (well apart from Michael Lewis, but hes kind of part time)
Adrian Reids podcast which I've been on a couple of times.
Neils Kaastrup-Larsens podcast which I've also appeared on.
Good for UK financial stuff
Podcast of the FT alphaville microsite.
Another ex AHL blog, this time on general Linux and open source geekery.
Another ex colleague of mine, now running an independent boutique economic advisory service.
The Motley Fool was what got me into finance way back in 1999 as the dot com boom accelerated. Sadly they recently closed their UK discussion boards (archives are still there); but you can find most of the original posters on lemonfool.
For authors, track your global amazon sales.