i have a white macbook from 2006 that i am still using now (I am typing from it) believe it or not it still runs relatively smooth for like surfing/editing/watching movies/even some more hardcore stuff (recently stream HD if other background apps are open is a bit problematic, but sometimes dpeending how hot the CPU is..
Also problem is that now macbook gets hot often and causes battery to expand which causes the trackpad not to work properly...short story yes i am going to buy a new MB AIR soon ... but I worked the living hell out of this book and it is still surprisingly running very well (every day for the last seven years); with a cooler I am sure I could solve the heating problem as well
Here is more info from mactracker:
Introduced May 2006
Discontinued November 2006
Model Identifier MacBook1,1
Model Number A1181
Order Number MA254LL/A (White), MA255LL/A (White), MA472LL/A (Black)
Initial Price $1,099 (White) $1,299 (White) $1,499 (Black)
Support Status Supported
Case White (1.83 or 2.0 GHz) or Black (2.0 GHz), durable polycarbonate
Weight and Dimensions 5.2 lbs., 1.08" H x 12.78" W x 8.92" D
PROCESSOR
Processor Intel Core Duo (T2400, T2500) ("Yonah")
Processor Speed 1.83 or 2.0 GHz
Architecture 32-bit
Number of Cores 2
Cache 2 MB on chip shared L2 cache
System Bus 667 MHz
STORAGE AND MEDIA
Storage 60, 80, 100, or 120 GB 5400-rpm
Media Slot-loading Combo or 4x SuperDrive (DVD±RW/CD-RW)
KEYBOARD AND TRACKPAD
Trackpad Solid-state trackpad supports tap, double-tap, drag and scrolling
Keyboard Full size (78 (U.S.) or 79 (ISO) keys incl. 12 function, 4 arrow, embedded keypad)