hi im a newbie and just wanted to know the features of n810 that e90 doesnt have? can e90 call skype to skpe via wireless technology? can i make calls anywhere with wireless internet access? thanks

Please search this forum first.

E90 can use skype with the "Fring" application, which is free. Keep in mind, however, that the sensitivity of the wi-fi transceiver of the E90 is much worse than that of the N800 (in my experience no gadget can beat the N800 or the 770 in this specific field). So if you intend to use voice over ip, I advice you to stick to the tablet. I have both, and use them together: the E90 as a PIM, as a GPRS modem for the N800 when no wi-fi is available, for sms and light emailing, and of course as a phone, and the N800 for say all the rest, including browsing and serious email.
But in my humble opinion the future is on the linux tablet side more than the symbian phone side.