Buy This, Not That

Excellent, should be read by everyone. Only 4 stars for me as it's very US centric but if you're even vaguely aware of your nations financial institutions and mechanisms everything is simple enough to transpose to your relevant locale.

After two years of rinsing the majority of my wages on vintage guitars and gear I am suitably shamed and inspired to start putting money away more sensibly again

Has very useful and well-explained rules of thumb about how to save, invest, handle debt, etc.