Mine personally is Insomniac Games. They Listen to their community and patch games almost directly from their input. Plus every game they have made averages around a 9 on Metacrtic. They also release their games on time which is more than I can say about most developers. One game is released around November for the most part every year. Who is your favorite developer and why?

Hands down it's got to be Data Design Interactive as they are the best third party developer on the Wii and they release their games so numerously I keep wondering how they were able to pull it off.

My top 4:

Nintendo EAD Group 3 - Zelda!
Kojima Productions - MGS!
Naughty Dog - Jak & Daxter, Uncharted
Team ICO - ICO, Shadow of the Colossus

As much as i hate to say it: Sqaure enix. They were gods before they merged with enix but i still have hope that both the ff13 games will be something special.

Camelot, they made my favorite series, shining force, and they're pretty good about supporting their community as well, they continued to press shining force 3 premium disks for years after the game was discontinued, plus they make the best sports games and golden sun, right now We Love golf is one of the games I'm most looking forward to

id. They've been my favorite since the glory days of Ultimate Doom.

Nintendo in general.

EAD for reasons too numerous to post
and squaresoft(SNES days)

Obvious answer Nintendo

Not so obvious answer. Rare / Free Radical / where Tim Stamper works now

obviously nintendo, for the best franchises and games.