• Because jellyfish are very intelligent creatures.
Geez, that sounds really self-conceited. Please ignore avatar while reading comment. Thanks.
• Because it sounds whimsical and sets the tone for the rest of the site.
And, as already pointed out, a little whimsy is always nice.
• Because as sferik pointed out, it embodies verb potential.
Okay, I didn’t really need the first link. But I loves me some permalinks!