This is a very important question for the future of the Maemo platform. I'm somehow unhappy with it, though. Here's why: You restrict it to current Maemo devices. It's obvious what's missing in current Maemo devices: voice telephony and everything that comes with it (SMS/MMS/video/...). I see no use in stating the obvious in this thread. Why not ask for Maemo in general, with a focus on the new version 5? Given the nature of Maemo, there's hardly anything that's not possible software-wise. So whenever somebody names a feature on S60 that he thinks is missing on Maemo, chances are that we know a way to work around that by installing 3rd party apps. I think a comparison should be done within clearly defined boundaries, and "what comes out of the box" would be good starting point IMHO... because this is what counts for the average consumer. Anyway, here's things I do regularly on my current S60 phone that I think are of some relevance as "gaps" for current or future Maemo releases. I tried not to include things that a do only twice a year or so... Voice telephony (several times a week) Video telephony over UMTS (not via internet) with other 3G handsets (several times a month) SMS (daily) MMS (several times a week) Sync contacts and calendar with online service (both http://scheduleworld.com and my carriers own SyncML-server) (roughly once a month) One thumb usage for each and every function on the device, like being able to surf/chat/mail while I'm holding onto poles or overhead straps in the bus/subway. (I spend ~90mins each working day in this position, my device'd better be good at that.) (daily) Run various Java MIDlets (run: several times a week; install new: roughly once a month) Bluetooth tethering, being able to work with a BT keyboard (tethering: several times a week; keyboard: several times a month) Another thing that I want to list extra (because it's not really a question of the operationg system alone... but the OS plays a big part) is the overall robustness of the device. How safe does it feel to carry the device in a pocket with keys and coins? Having to use some sort of extra protection is a no-no for something that should be a phone, so it better pass this test. Current S60 devices up to S60v3 do. S60v5-devices don't, and current Maemo-devices don't, either.