Ok, I respond to each question in order, with corresponding numbers.
1). Good MOBOs are based on their chipsets (I prefer nForce from nVidia) Secondly, why would you want a P4?? AMD64 pwns P4's in every sense of the word PWN. They are faster, more effcient, less heat, lower energy use, 64bit, better designed cores, SOI vs COI, higher data output rates thx to the higher pin configurations, and so much more.
2). ATA133 is the Newer ATA, however, SATA is ATA150 same thing... SATA150 is serial ATA. It uses the FASTEST data output rates at 150MB/sec. Go with SATA if you can, it is the future of technology.
3). On DVD Burners, there are many options. I would get a DVDRAM drive, just use newegg.com for that. If not a RAM drive, get a 16X DVD+-RW Dual Layer. Dual Layer are those disks that literally have two (2) layers of data encoding on them. The burner burns on the deepest level first, then burns on the top layer last. They are double the capacity of normal DVD disks. If you are doing backup however, you should get a magneto optical drive (they store huge amounts!!) Just use Newegg.com and search for Magneto.
4). Ok, Corsair is a memory company. They are a good company, just not what I WOULD RECOMMEND. I recommend you go with Geil, or if you are ready for the fastest RAM in the world, Crucial Ballistix or Kingston HyperX Low Latency Series. Geils UltraX is also right up there with those 2.
4 Contiuned). This deserves another part of discussion. A Prescott is the core of the Pentium4 series, along with a Northwood core, and the Pentium4 Extreme Edition (waste of money) which uses the newer advanced 1066Mhz Northwood core. Pentiums are OK processors, and are fast, but are INEFFICIENT!! They take 20 steps to process a command, while an AMD64 takes only 8. Thus, AMDs don't need to run as fast to do as much work. Not going with AMD is really not a good choice at all. Pentiums are the same price, and you should really go with a processor that will last you at least 4 years since it is 64bit. The only Intel processors that are "64bit" are the newer EM64Xeons, and the EM64Itanium chips, both of which you don't want, since they are server bound. On AMD's, there are many more cores available to you. The main one is the Newcastle Core, however, the best AMD cores are the Sledgehammer and Clawhammer cores, since they are based on the SOI technology (Silicon on Interconnect) I would go AMD, it is the best for the money, speed, efficiency, and everything else.
5). There are quite a few settings that need to be configured. The main one is the BIOS (Basic Input Output System) The BIOS is the cerebellum of the motherboard (it holds the basic commands for hardware but really isnt a program). The BIOS has to be configured correctly so that all the hardware works together. There are many settings on MOBOs, but overall, moving a few jumpers fixes most things. The hardest thing is connecting the front LEDs and controls on a tower to the MOBO, since it is sometimes hard to find those pins. RAM is easy, Front Side Bus can be a pain if you are not careful, and Hardrives need to be in the proper settings (one master, multiple slaves) Then you install XP on your MAster Hardrive.
6). I cannot answer this question without a price range you want to spend on the GPU. Also, I need to know if you plan on going PCI Express of AGP, and some other details such as do you plan on gaming alot, or graphic design, or what? Tell me this, I tell you what you probably want for a Graphics Card (GPU)
Your welcome, my fingers are on fire, so if you excuse me, I need to go plunge them underwater after typing this amount of info. Have a nice day, and USE AMD!