Scite is not a bad editor, but the version I have (1.72) crashes on largish ruby files (there's one file that's 65KB it consistently barfs on). Are newer versions any better?
1.72 is approaching 3 years old, since then there have been numerous speed and stability updates to SciTE. So yes, new versions are better. Do they crash less often? In general I would say so, but I never really had any great problem with SciTE crashing.
@pavium's suggestion of using a different editor isn't a bad one; if you live in your text editor having something powerful, extensible and readily available is very nice. Both
If you just want to hack out text and don't care to learn
On Windows, between SciTE, Notepad++ and Notepad2 I prefer Notepad++ but Sublime Text is finding its way into my arsenal. I tend to use