Would this be a good mother board? I'm biulding a new system.

Intel D865GBF DDR with Pentium4 2.4Ghz 478Pin (800FSB) CPU w/Fan.
SKU: D865GBF@2.4(800)
Processor: Support for an Intel Pentium 4 processor in a mPGA478 socket with a 400/533/800 MHz system bus Hyper-Threading Technology Support
Support for an Intel Celeron processor in a mPGA478 socket with a 400 MHz system bus

Memory: Four 184-pin DDR SDRAM DIMM sockets
Support for DDR 400, DDR 333, and DDR 266
Support for up to 4 GB of system memory

Chipset: Intel 865G Chipset

I/O Control:SMSC LPC47M172 LPC Bus I/O controller 

Audio: SoundMAX 4 XL with AudioESP audio subsystem using the Analog Devices AD1985 codec 

Video: Ati Radeon 9800 Pro 128MB DDR AGP 8X w/ CRT TVO & DVI

Integrated retention mechanism 
Peripheral Interfaces USB 2.0 ports
1 serial port
1 parallel port
2 Serial ATA IDE interfaces
2 Parallel ATA IDE interfaces with UDMA 33, ATA-66/100 support
1 diskette drive interface
PS/2* keyboard and mouse ports 
Form Factor ATX 

YUK!  NO WAY!    

That board has Onboard Graphics and is therefore out of the question if you are a serious gamer/simmer. Intel Extreme Graphics (The onboard graphics chip, integral to the mainboard) simply doesn't cut it when it comes to FS9 for instance.

Even if you upgrade to a fast addon video card, it will never be as fast as a board without onboard graphics.
In fact, Intel's site shows a pic of the board, and I don't see an AGP slot on it, although the speil says it has one.

Intel's production mainboards are noted for system stability, and are similar to "reference boards" in design. They would be my first choice in an office environment.

However, they aren't tweaked for speed and usually benchmark slower than the opposition. Gamer's generally go for a third party board such as a Gigabyte or Asus chasing every scrap of performance they can get.

Look at the Intel 865PE chipset if you want a hint. There is a plethora of good boards made with it.

Good Luck