'Time' is amazing -- one of my top favourite Gilmour solos ever. Being the sucker for all types of slide guitar that I am, I am also excessively fond of his slide-work, particularly that on 'Breathe' and 'The Great Gig In The Sky'. The solo in 'Wots... Uh The Deal?' is a favourite as well.
Believe it or not, two of my favourite moments are actually when he plays the fretless bass, on 'Pigs (Three Different Ones)' and 'Hey You'. He plays bass with pretty much the same melodic sense as he plays lead guitar, so it's easy to spot when he's taken on bass-ing duties.
You know that I care what happens to you, And I know that you care for me too. So I don't feel alone, or the weight of the stone...
David experimented quite a lot over the years with his tone, and different ones to suit different songs. Which Gilmour guitar tone is your favourite?
As for me, I'm very fond of his fairly clean tone from the Atom Heart Mother era, and also 'Shine On You Crazy Diamond' (all of it). The tone he used for the riff in 'Echoes' is also rather neat, as it sounds, I dunno, watery -- which suits the song perfectly.
I'm not quite as fond of his The Division Bell tone (that having been said, I still love the solos), and as usual, I can't stand anything about A Momentary Lapse Of Reason.