Career advice from the Fields medalists and some other mathematicians
The career advice from Sir Michael Atiyah (see also his lecture containing some bits of career advice (hat tip: N.E.W.)), Béla Bollobás, Alain Connes, Dusa McDuff, and Peter Sarnak is here:
Advice to a Young Mathematician
This is an excerpt from The Princeton Companion to Mathematics. By the way, the most recent errata for PCM are here.
See also great advice from E.W. Dijkstra and J.H. Conway, excellent career advice and writing tips from the blog of Terence Tao, and Six Rules for Rewriting at the Michael Nielsen’s blog.
Finally, here go the interviews containing some nice bits of career advice: Alain Connes, Maxim Kontsevich, Sergey Novikov, Terence Tao (see also his Google buzz page and this blog post).