In this post I'm going to list the popular Intel desktop CPUs currently available.  I'll try to keep this updated with information from Intel as processors change.

There are currently six Intel processor streams:

• Pentium Processor Extreme Edition 
  
  Processor Number: 840
  Clock Speed: 3.20 GHz
  Front Side Bus: 800 MHz
  Chipset:
  - Intel 955X Express
  Socket: LGA775
• Pentium, D Processor 
  
  Processor Number: 840, 830, 820
  Clock Speed: 2.80 GHz to 3.20 GHz
  Front Side Bus: 800 MHz
  Chipset:
  - Intel 955X Express
  - Intel 945P Express
  - Intel 945G Express
  - Intel E7230
  Socket: LGA775
• Pentium 4 Processor Extreme Edition supporting Hyper-Threading Technology 
  
  Processor Number: N/A
  Clock Speed: 3.20 GHz to 3.73 GHz
  Front Side Bus: 800 MHz to 1066 MHz
  Chipset:
  - Intel 955X Express
  - Intel 925XE Express
  - Intel 925X Express
  - Intel 915G Express
  - Intel 915P Express
  - Intel 875P Express
  - Intel 865PE
  - Intel 865G
  - Intel 865GV
  - Intel 848P
  Socket: LGA775, mPGA478
• Pentium 4 Processor supporting Hyper-Threading Technology and the Pentium 4 Processor 
  
  Processor Number: 670, 660, 650, 640, 630, 571, 570J, 561, 560J, 560, 551, 550J, 550, 541, 540J, 540, 531, 530J, 530, 521, 520J, 520
  Clock Speed: 2.80 GHz to 3.80 GHz
  Front Side Bus: 800 MHz
  Chipset:
  - Intel 945P Express
  - Intel 945G Express
  - Intel 925XE Express
  - Intel 925X Express
  - Intel 915G Express
  - Intel 915GV Express
  - Intel 915GL Express
  - Intel 915P Express
  - Intel 915PL Express
  - Intel E7230
  Socket: LGA775
• Celeron D Processor 
  
  Processor Number: 351, 350,  346, 341, 345, 340, 336, 335, 331, 330, 326, 325, 320, 315
  Clock Speed: 2.26 GHz to 3.20 GHz
  Front Side Bus: 533 MHz
  Chipset:
  - Intel 915GV Express
  - Intel 915GL Express
  - Intel 915G Express
  - Intel 915PL Express
  - Intel 915P
  - Intel 910GL Express
  - Intel 865PE
  - Intel 865P
  - Intel 865GV
  - Intel 865G
  - Intel 848P
  - Intel 845PE
  - Intel 845GV
  - Intel 845GE
  - Intel 845G
  - Intel 845E
  - Intel E7221
  Socket: LGA775, mPGA478
• Celeron Processor 
  
  Clock Speed: 950 MHz to 2.80 GHz
  Front Side Bus: Up to 400 MHz
  Chipset:
  - Intel 845GV
  - Intel 845GL
  - Intel 815E
  - Intel 815
  - Intel 815EP
  - Intel 810E2
  - Intel 810E