Lots of good answers here. To chime in a few: - Beej's Guide to Network Programming (1994 originally I believe). Fantastic intro to networking programming via

Lots of good answers here. To chime in a few: - Beej's Guide to Network Programming (1994 originally I believe). Fantastic intro to networking programming via the Unix interfaces. - The C Programming Language (1988 for 2nd edition). There has been change, but not a crazy amount. - Mastering Regular Expressions (2006). Never look at a regular expression with fear again! - Patterns of Enterprise Application Architecture (2002). Some of the patterns are antiquated but a lot of them are fantastic for modern development. Some of them are core to a lot of development now but we just don't think of them.