Cavenagh: also would a gamepad be anygood for IL-2 Sturmovik™: 1946, or do I need a joystick?
skeletonbow: IL-2 Sturmovik is a proper flight combat simulator which IMHO can only be experienced properly with a proper flightstick or flightstick+throttle+rudder system along with a zillion keys on the keyboard (although many are assignable on modern flight stick hardware).
There's also another thing. With these new (XBox360 etc.) gamepads the area of movement for the analog sticks is round, while with the older PC analog joysticks and (Dualshock) gamepads it is usually square, and the older DirectInput PC games also expect it to be square. You can't fit a square to a circle, and vice versa. :)
What this can mean in practise is that e.g. you can't reach the diagonal maximums in those older games (like flight sims, space combat sims etc.) with the newer PC gamepads. You can probably see this in e.g. GOG version of Prince of Persia: Sands of Time, where you can't run and turn ("run in circles") at the same time with modern gamepads. If you start turning the analog stick while running, you start walking because you don't reach the corners.
Whether this is an issue or not, depends on the game (e.g. set your controls so that you don't have to care about the diagonals, e.g. in racing games use the left stick (or the analog triggers) just for speed and braking, and the right stick for steering left/right). Also, it might be some gamepads take this into account and the "circle" is bigger than the "square" meaning you can reach the diagonal maximums, but that would then decrease the accuracy of the stick in up/down and left/right directions.
So all in all: it is still a good idea to have a proper flightstick (with a square area of movement) for flight sims and such.
EDIT: I guess I could have just linked to the earlier thread I started about this issue...
http://www.gog.com/forum/general_archive/classic_vs_modern_pc_controllers_diagonal_movement/page1