I love Notepad++
Notepad++ is one of the most *useful* tools I've worked with over the years. Powerful, fast editing (column mode FTW!), great search and replace, plug-in support, continuous save, remembering everything you had open the last time you closed it, and on and on. One of the first apps I install on a new machine, and I would gladly pay for it if it wasn't free. Congrats on turning 20!