ReMax
The logo you're describing is likely the logo of the brand "Red Robin," an American casual dining restaurant chain known for its gourmet burgers and family-friendly atmosphere. The red circle with a white capital "R" is a distinctive feature of their branding. If you meant a different logo, please provide more context for clarification.
The logo is aTm. But the "a" and "m" are capital but smaller then the "T".
R+
Any company that has registered their logo.
The Rolls Royce logo is basically just two capital letters overlaped, the letter "R". This symbolizes the the abbreviation for Rolls Royce. Nothing complicated about it, just classic and elegant like the car.
A
Netscape
Kelloggs.
MTV
Flickr's logo has a blue k and red r in it.
Sanyo
I think you mean the Roncato logo. :)