#19 looks very cool but as desktop icon i fear that with 16*16 or also 32*32 pixel you can't recognise that these are 2 u And for printing on docuemnts or visitcards - the 3D Effect i don't know if it is good for that.
At the moment i prefer #68 or #55 maybe you can tweak them a little? Do you have ideas for the area where the 2 us are together? (And the text Ulysses should be in only one color) And the shadow - its a 2D object, i think we don't need them?