Most commonly used naming conventions.

Heres what I do:

Types are in the form TThing such as TAlien or TColorRequester where the first letter of each 'word' within the name is capitalized.
Functions and Methods are in the form Update or GetPosition the same as Types without the preceding T.
Variables are in the form aliens or current_file where every letter is lowercase and 'words' are delimited by underscores.
Constants are the same as variables except letters are uppercase such as MODE_CLIENT or SHIP_MAX_SPEED.

Example:

Superstrict

Type TAlien
    Const SPEED:Int = 6
    Const HEALTH:Int = 10

    Global aliens:TList = CreateList()

    Field x:Int
    Field y:Int
    Field direction:Int

    Field velocity_x:Int = 0.0
    Field velocity_y:Int = 0.0

    Function Create:TAlien(x:Int, y:Int, direction:Int)
        Local alien:TAlien = new TAlien
        alien.x = x
        alien.y = y
        alien.direction = direction
        ListAddLast(aliens, alien)
        Return alien
    EndFunction

    Method Update()
        x :+ velocity_x
        y :+ velocity_y
    EndMethod

    Method GetSpeed:Int()
        Return Sqr(velocity_x * velocity_x + velocity_y * velocity_y)
    EndMethod
EndType