1. Timex TMX2
The ultimate combo: With 64MB aboard, the TMX2 transforms from wristwatch to pendant to carabiner. Price: $150.
2. CenDyne Gruvstick
Pop the 128MB Gruvstick (or Innogear Duex, below) into a USB port for easy MP3 transport. Both display artist and track information and cost $179.
3. Bantam BA800
Your pictures meet your music with the 256MB BA800—it incorporates a 1.8-inch color display. Price: $299.
4. Creative Labs Nomad Zen
Plug it into a USB or Firewire port for ultrafast downloads to its 20GB, 8,000-song hard drive. Price: $350.
5. Sonic Blue Rio S35S
A rubber grip, one-button navigation, FM radio, 128MB and armband make it a perfect workout companion. Price: $200.
138 years of Popular Science at your fingertips.
Each issue has been completely reimagined for your iPad. See our amazing new vision for magazines that goes far beyond the printed page
Stay up to date on the latest news of the future of science and technology from your iPhone or Android phone with full articles, images and offline viewing
Featuring every article from the magazine and website, plus links from around the Web. Also see our PopSci DIY feed
Science is reinventing play, from extreme sports to gamification to ridiculous roller coasters to the playgrounds of tomorrow, and this issue is chock full of fun. Also, on a less fun note: Did global warming destroy my hometown?