Unfortunately (primarily due to my lack of programming knowledge) I have not yet found a way to give the user an option of choosing whether or not to show the dock icon. I personally think that the menu bar item is more useful for iSyncIt so the dock icon will remain hidden for now. If any programmers out there know how to achieve the choice of dock hiding in Obj-C then feel free to contact me.
On that bombshell, iSyncIt 0.4 has now been released. All of you using automatic updates in 0.3 should receive it straight away but for everyone else it is available from the software section or you can get it from MacUpdate and let me keep track of the number of downloads. All the changes in this version are on the software page.