If you have wifi at home, you could install FTPserver on your phone, turn it on and turn your phone into a little ftp hub, then ftp from your computer to the phone to transfer files without having to physically plug it in via the usb. Still requires a few extra steps to get from calibre -> aldiko (e.g., loading the books into aldiko once they'r on the phone), but at least you'd skip the cable.
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