One of my favorite bands, and definitely one that is overlooked far too often. Very few bands can say that their first four studio albums were as good or better than Camel's first four. Moonmadness and Mirage are both desert island discs for me, in particular.
I also love the fact that they were very progressive, but never in the sense of overplaying at all or of having exaggerated song lengths. Many of their great songs seem to fall in the 5 to 10 minute range. Andrew Latimer's clean guitar tone is to die for, and how can you not love a band that regularly features a flute?!
And for point of reference, for those on the forum who haven't heard them yet, Mikael Akerfeldt of Opeth has listed them as one of his biggest influences, and the most notable Opeth songs where this is evident are "Ending Credits," Benighted" (this one because the main acoustic riff is pretty much taken from "Never Let Go" from Camel's debut) and "Atonement" (on this one, the vocals under water effect, which Camel sometimes used to great effect, are in full force).