Good questions. As Samboe said, we've always had debates about raid times and ended up at the same conclusion, that the time we have is the best due to having people in every time zone.
Currently:Our non-scheduled puggable raids are:
all pre-WotLK raids
OS 10/25
VoA 10/25
Naxx 10/25
Ulduar 10/25
Anyone can start a raid to go to any of these places and recruit for it in guild chat as long as its not during regular scheduled raid time. If your hankering to get a group going, awesome, lead and help your guildies get geared! You can even set up a regular schedule if your leading EXCEPT again, please do not plan on recruiting for these raids during normally scheduled Redeemed raid times until after the Redeemed lead raids are going. You can run them all weekends, all during day hours as much as you like, or after the scheduled raid is full. This type of member initiated raiding helps the guild, and its awesome when someone steps up to lead.
Scheduled raids are ones where our guild raiding is focused, including farm content that reliably yield dead bosses and upgrade gear and progression content that tests the guild's ability to down bosses. Guildies should not create their own runs of these raids and Veterans should not run them with PuGs or other guilds.
Our scheduled raids are currently Mon,Tue,Thur,Fri 6 server:
ToC 10/25
Ony 10/25 (this becomes puggable after Friday night of each week)
ICC 10/25
Hope that helps give you some ideas. Happy raiding, and Merry Christmas!