The
Dell bootlogo can be changed by flashing in a modified ROM, I currently have a custom logo on my X30 Mid which has not caused any problems so far.
Be aware that it is a fairly involved process and there is an element of risk. At worst your PDA will be bricked and cannot be recovered by any means except by flashing via JTAG (has anyone traced the JTAG port on the X3/X30?).
If you have not been put off by the above then feel free to bug me for a tutorial, as long as the Mods have no objections to such information being posted that is.
UPDATE: Tutorial for the X30 is
here.