i have a Creative Zen NX (4yrs old) and a ZVM 30Gb bought last summer. here's my take on this. cant remember all the figures so do some quick research to double-check them. it's always good to compare specs of 2 products side by side.... TV commercials and people's blabbing (like my blabbing here) dont mean much.
1) ZVM screen supports about 260,000 colours. iPod's screen supports 60,000 colours only.
2) ZVM supports videos on MPEG-1, MPEG-2, XviD, MPEG-4 SP, DivX (4.x and 5.x), Motion-JPEG (commom in Digital Cams) and WMV. iPods only support their own video format, which is a particular implementation of MPEG-4. that means that you will need to convert 99% of the videos you ever try to transfer to the iPod. the only times i need to convert a video before transfering to my ZVM is when i come across old DivXs 3.1 or videos with AC3 sound. i have Hauppauge TV card so i always record stuff on VCD/SVCD format (DVD resolutions are overkill for the player's screen size) and i transfer them straight to the player without conversions. sometimes i remove commercials using VideoReDo's Automatic Ad-Removal function....
3) ZVM supports audio on WAV, MP3 and WMA (not that i care about the latter). and you will be allowed to copy your songs back and forth out of the player without conversions or *restrictions*. from or to CD-Rs/DVD-Rs, hard drives, Pen Drives etc with no transcoding or limits on the number of copies you make. no restrictions on which or how many PCs you plug your ZVM to either. and if in 2 years you decide to buy a payer from a diffrent manufacturer, you wont have to re-buy your songs or re-rip them.
4) ZVM is compatible with *several* online music stores (not that i care coz DRM suck). iPods only support iTunes.
5) ZVM's Signal to Noise Ratio is 97dB. the iPods SNR is a mistery.... last time i checked, the info wasnt availabe on the box, manual or Apple website....
6) ZVM's battery life is officially 17hrs for audio and 5hrs for video. in practice, it lasts longer than that coz i only recharge my player every 10 days and i do play music and video during my subway rides...twice everyday! check iPod's battery life. i know it's shorter but i dont know by how much.
7) Creative is specialized in audio and has been making MP3 Players (old ones were damn ugly) for a lot longer than Apple. iPods are a new beast and have capitlized solely on looks (it does look good) and hype since inception.
8) ZVM supports JPEG, GIF, PNG and BMP. the JPEGs are transfered without conversions. on iPods, unless it has changed, the pics are always resized. so if you need to transfer a pic back to your PC or a disc, it wont be the same pic with the same size/resolution anymore.
9) ZVM has Voice Recorder, and FM radio (not that i care about either) and supports output to TV.
10) ZVMs are thicker than iPods....prolly because the battery has longer autonomy....
Creative will be incorporating their X-Mod technology into their next generation of MP3 Players but there are no dates for such products to hit the market yet. the only players that really rival the ZVM are the ones by Archos coz they have bigger screens and even more video format support (DivX with AC3 audio included).
a ZVM is a steal even for $405....let alone $105!