

ARM Cortex-A8 600MHz processor with up to 1GB of application memory (256MB RAM and 768MB of virtual memory).
3.5 inch widescreen, 800 x 480 pixels resolution, resistive touch.
Dimensions of 110.9 x 59.8 x 18mm (19.5mm at camera), weight of 181g. This is shorter, but wider, thicker and heavier than the N97 (117 x 55.3 x 15.9mm at 150g). It's significantly smaller than the N810 (72 x 128 x 14mm at 226g), the previous Maemo device.
Horziontal slider form factor with 3 line QWERTY keyboard on the lower slide and integrated (around the camera) device 'kick' stand.
WiFi (b/g) (includes UPnP support) and HSDPA connectivity (triband WCDMA 900/1700/2100 and quadband GSM). The 1700 band is for T-Mobile USA (which suggests the N900 is headed for a carrier in the US to go up against Palm Pre (Sprint) and iPhone (AT&T).
To be clear - this is a phone, in contrast to previous Maemo devices which had no cellular telephony functions. However, in contrast to Nokia's Symbian smartphones, it might be considered a mobile computing device first, then a phone.
5 megapixel main camera (2.8 aperture, 5.2 focal length, dual LED flash and video light), with Carl Zeiss Tessar optics, video capture at WVGA (800 x 480) at up to 25 frames per second. Camera supports geotagging, tagging with keyword and ability to share to Ovi and Flickr.
Integrated GPS with A-GPS.
Integrated FM trasnmitter.
Bluetooth 2.1, including full support for stereo headsets (A2DP and AVRCP).
Nokia 3.5mm AV connector for audio input/output and TV-Out.
microUSB for connectivity and charging.
32GB of internal flash storage, microSD card slot.
Nokia BL-5J battery with 1320 mAh capacity.
Runs Maemo 5; Nokia say, 'Maemo brings the power of computer to mobile devices. Designed with the Internet at its core. Linux-based Maemo software takes us into a new era of mobile computing'.
Browser (Fennec) powered by Mozilla technology, supports full Flash 9.4 and AJAX.
Customisable 'panorama' desktop and multi-window task switcher.
Unified communications and address book: voice calls, internet calls, instant messages and SMS. Includes the ability to merge phonebook, Skype contacts and other contacts into a single address book.
Ability to share status, location with friends, keep multiple IM and SMS converstions going and move between them.
Nokia Messaging pre-installed, mobilise up to 10 personal email accounts. Includes quasi-push email and rich HTML support.
Video playback H.264, MPEG-4, XviD: up to WVGA (800 x 480) at 25 frames per second; WMV: VGA resolution at 30 frames persecond; Flash.
Video streaming in the browser.
Music playback formats include MP3, AAC, AAC+, eAAC+, M4A, WAV, WMA.