yeah you can not just trademarks "i" but you can sue people if they use your whole trademark name like "ipod" to be "ipodo" on their product.
Have you ever count how many stuffs you could find to add in your personalized iGoogle? I have tried to see through all of them but i gave up first. (i been through like 1500+ gadgets) Do anyone know the answer or how far did you go? I have added like 20+ stuffs to my personal pages and how many stuffs you got? ^^