The DTE RS-232 module is a tight and tidy way to convert RS-232 (computer-level) signals down to a microcontroller level signal strengths. DCE means it's configured as a "Data Communications Equipment" (with 9 holes).
RS-232 to RS-485 - sometimes you need the flexibility that a RS-485 gives you over the simple RS232!
Basic breakout board for FTDI's popular USB to UART IC. Now with internal oscillator and EEPROM, the FT232RL is an impressive IC!
The Prop Plug is a compact USB to Serial connector for microcontroller programming and communication. We're about the best place in the universe to get them!
Add a USB drive or thumbdrive to your microcontroller!
The I2C-RTC board is a 6-pin CMOS Real-time Clock device using I2C bus. There are no external components required.