Really need aftermarket heat-sink fan and paste.
I got 3 of these over a year ago. Needed an unlocked Athlon to go with my Asus A7M266 (with wire trick) and I got it up to 2.10 with no problems even though technically not supposed to work with that motherboard. This was the best bang for the buck (I have 3 desktops and a laptop). I won't be buying any new ones until SATA II is out and it will definitely be an AMD again, probably the FX series or maybe those dual processors ones stacked on top of each other when they come out. When I get another laptop, if it's a really small one I'll be getting an Intel M Centrino, otherwise I'll probably go with AMD.
For most applications it works just fine. Have friends with P4 3.06, and P4 3.2 with 2GB Ram and 95% of the time cannot tell the difference. Except when ripping dual layer DVD's, which I don't do that often anyway.
The thermal paste for the retail stock cooling.
When I got a new motherboard that could support a processor with a FSB of 333 MHz, I knew I wanted to get a barton chip. I didn't have a whole lot of cash to get the 2800+ or the 3000+ so I settled with a 2500+ chip. Its a really nice chip. I immediately noticed the difference between this chip and my Athlon 2500+ (I use programs like photoshop as well as gaming). Then I decided to start overclocking it. Even with stock cooling, I have had no problems overclocing this chip to 3000+ speeds. I do plan on upgrading the cooling for the chip so I can achieve higher overclocks with voltage changes.
Get this processor.