Singing notes while playing scales

Let me make it clear; I am no singer, but I have found it very useful to hum the notes of a scale/arpeggio when practicing them on the guitar.

One of the reasons why I do is if I hum the notes while I play, then if I was to go wrong, firstly I would hear that I had gone wrong, and then I would be able to go back to the point of my mistake, and be able to identify the note that should have been played from the corresponding note in the 'hummed' scale.

Secondly, it has helped me become much more aware of what the notes actually sound like. This helps loads when I am figuring out a chord sequence or riff to a song. I can hum the note/chord pitch from the song, and then be able to identify the general area of notes that that pitch is from, making it much easier to pinpoint the note/fret that is played.

Sadly, I cannot listen to a song, and hear a note, and be able to say 'oh, that's an F' immediately, but hopefully that will come with practice.