One of the most popular but also the largest types of memory, Compact Flash comes in two physical sizes.  Type I cards are smaller, while Type II are slightly larger.  Most memory cards presently are Type I cards.  All prices and model numbers are for 256 MB cards.  Quotes are from the respective companies webpage and are not a value judgment of davespda.com.
 

Kingston Standard (CF/256) - Check Prices
    "For everyday use of Digital Cameras, PDA's, and MP3 players, Kingston's standard CompactFlash is the perfect solution for these applications." - www.kingston.com

Kingston Elite Pro (CF/256-S) - Check Prices
    "The Elite Pro line offers a memory grade for professionals who require higher write speeds and lower power consumption from their CompactFlash cards. This allows Elite Pro users the opportunity to get additional speed and performance out of their Digital Media based equipment." - www.kingston.com

Lexar High Speed Series (CF256-16-360) - Check Prices

Lexar Professional Series (CF256-40-278) - Check Prices
    "Lexar Media's Professional Series CompactFlash is designed to speed up image transfer times by taking advantage of a Digital SLR camera's high-speed processor. Capable of sustained write speeds of 6mb per second..." - www.lexar.com

Memorex (32501256) - Check Prices
    "Memorex's CompactFlash offers solid-state construction and an on-board controller that is oblivious to extreme temperatures, high levels of shock and jarring vibration." - www.memorex.com

PNY (P-CF256-RF) - Check Prices
    "PNY CompactFlash cards are the optimal storage upgrade for digital imaging, portable computing and multimedia systems. PNY CompactFlash cards can be written and reused thousands of times and have been optimized for speed, capacity and durability." - www.pny.com

Sandisk Standard (SDCFB-256) - Check Prices

Sandisk Extreme (SDCFX-256786) - Check Prices
    "SanDisk Extreme CompactFlash is designed exclusively for the high-end, professional photographers who work under extreme conditions and expect the very best in products and support services." - www.sandisk.com

Simple Tech (STI-CF/256) - Check Prices

Verbatim (47008) - Check Prices
    "Lexar Media's Professional Series CompactFlash is designed to speed up image transfer times by taking advantage of a Digital SLR camera's high-speed processor. Capable of sustained write speeds of 6mb per second..." - www.lexar.com

Feel free to email me about your own PDA, questions, comments, articles, rumors, and reviews.  I can be reached at dave@davespda.com.