Nokia is one of the big companies. Nokia tries to fulfill all of its features with a very incomplete.  And the Nokia N900 has a variety of features that could be an alternative choice for potential users. 
Specification :

• Up to 32 GB internal storage
• microSD memory card extension, hotswappable, up to 16 GB* (current availability)
• Total available application memory up to 1 GB (256 MB RAM, 768 MB virtual memory)
• Quad-band EGSM 850/900/1800/1900, WCDMA 900/1700/2100
• Automatic switching between GSM bands
• Flight mode
• GPRS class A, multislot class 32, maximum speed up to 107/64.2 kbps (DL/UL)
• EDGE class A, multislot class 32, maximum speed up to 296/177.6 kbps (DL/UL)
• WCDMA 900/1700/2100. Maximum speed PS up to 384/384 kbps (DL/UL)
• HSPA, maximum speed up to 10 Mbps (DL), 2 Mbps (UL)
• WLAN IEEE 802.11b/g
• WLAN Security: WEP, WPA, WPA2
• WLAN wizard
• Designed for continuous TCP/IP connectivity
• Capability to serve as data modem via USB connection

It's really very interesting and fantastic. Operating systems Maemo 5 software and user interface with direct touch logic, 3D accelerated graphics, and multiwindow multitasking menu logic. Almost all of the features on the Nokia 900.

Nokia N900 with maemo will have high-performance mobile computers with powerful processors, large internal storage, and sharp touch screen display.