Smaller, cheaper, and less powerful in audio than the company's earlier iPig and Panda systems, Speakal's new iBoo ($90) is a ghost-shaped speaker set with an iPod dock on top, drivers in its eyes, and a subwoofer firing downwards from its main chassis. The subwoofer drops from iPig's and iPanda's 15 Watts to 9 in power, and the prior system's four other speakers become only two here, with 3 Watts each of power in iBoo's eyes. A simpler remote control…