Stuff I keep writing, over and over... - Brian "Krow" Aker's Idle Thoughts

String Classes
Mini TCP/UDP server and client implementations for generic problems
Memory allocators
IP War Dialing systems
Lists
HTML Parsers
Buffer classes (of all sorts)
Methods for tracking web users

Of all of these, I am amazed at the number of times that I have thrown out a "tracking web users" system. At some point either the system breaks, doesn't deliver value, or I run into some security annoyance...