I've made links below of all the features that are new or different on the KD-SH909 compared to the KD-SH77 I had previously.

Features:

• Power Output: 200W Max. (50W x 4)
• Motorized Slide-Out Aluminum Face
• HS-IIIi Tuner
• Multi-bit (24-bit Resolution) 1-bit DAC
• CD-R/CD-RW Compatible
• MP3 Compatible
• iEQ (7-band)
• 4V Line Output Level
• Gold-Plated Line Output Terminals (x 2 pairs)
• Subwoofer Output Terminals with Level Control
• Adjustable Line Input/Front AUX IN
• DVD/VCP Control
• Pop-Out Rotary Encoder Multi-Control
• Card-type Wireless Remote Control

• Station Name Registration
• 6 AM + 18 FM Presets
• SSM (for FM)
• Seek
• AFNS/PNC
• Stereo/Mono Switch
• European Switchable Tuner

• Preamp Fader Control
• Loudness Control
• Electronic Volume Control
• Volume Attenuator
• Amp Defeat Switch

• CD Text
• Disc Name Registration
• Direct Track Access (1-12)
• Random/Repeat Play
• Intro Scan

• Direct Disc Select (1-12)
• Random/Repeat Play (2 Modes)
• Intro Scan (2 Modes)

• White LED Backlight
• Dot-Matrix Multi-Color LCD Display with Contrast Control
• Switchable Dimmer
• Sound Meter
• Power Switch Standby Illumination

• Beep Tone Support
• Detachable Control Panel with Carrying Case
• COMPU PLAY
• Power-Off Mode Eject
• Preferred Setting Mode

MP3 Compatible
Last year, only the KD-SH99 played MP3s. This year, the KD-SH707 and KD-SH909 play mp3s. From what I've read in reviews online, the JVC is one of the best MP3 compatible decks for the price. The reviews I read claimed seek times (the time taken for the deck to seek to a new song) of approximatly 2 seconds, and my experience has confirmed this. With 192 kbit MP3s, it's indistinguishable from CD, according to Chris, a vinyl junky.

iEQ (7-band)
The KD-SH77 had a 3-band EQ with rather confusing settings. For each of the 3 bands, you set a mid-frequency from a choice of 2 or 3, then you set the width, ranging from 1 to 4, depending on the band, then you set the acctual level. While this did give a lot more flexibility versus just setting the level, it was rather confusing to work with. In the KD-SH909, it's a plain old 7-band EQ, where you simply set the level on each band. I definatly prefer this new one.

Dot-Matrix
The LCD on the KD-SH77 had a single line of dot-matrix display, for displaying arbitrary text. This was sufficient for the KD-SH77, but with the introduction of MP3 capability in the KD-SH909, two lines of text were needed for displaying MP3 tag information. What this means is that the dot-matrix portion of the LCD is now twice the size, and JVC makes use of it quite well.