Here's the tutorials in my Photoshop favorites folder:

Saava's tutorial (has some mention of text, but mostly talks about playing with color)

Tigress's manip tutorial (which I refer to because sometimes I make manips and then icon them)

Quebelly's icon brushes and tips

Layrakaye's icon tips (a whole section on text)

Iconmaking 101

Some patterns from Jess79 (which are different from brushes? I think.)

Icon tutorial from Isabel0329 (some mention of text, mostly placement and effects and color)

SV Icon Tips FAQ (text section)

Some of these contradict each other, so I use different ideas depending on which icon I'm making.