1. Valve is valve, and can hardly be included when grouping "Publishing companies" together (as they tend to do the exact opposite, with their games often releasing late, if they even do).
2. Westwood and Petroglyph were/are Development studios and not publishing companies. Westwood's publisher was Electronic Arts. Petroglyph is independent, but most of their games do still have publishers (for Star Wars: Empire at War, it was LucasArts, for Universe at War: Earth Assault, it was SEGA, for End of Nations, it's Trion Worlds).
Though one thing worth noting sometimes with indie games is that while you might not have a publisher breathing down your neck, many indie game developers don't have another income source, which can cause a rush of "release before you go broke". They still produce superior products most of the time.
Admiral_Tails
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