Korean Unicorn Information System offers a media HDD enclosure with LAN and Wi-Fi interface.

Update:
The MVix Wireless HD Media HDD Enclosure is shipping NOW!

I have not found yet any other AV HDD enclosure that features a wireless interface. The MVIX seems to be the first one. If you know about another please email me.

Media HDD enclosures with LAN are available, like the AL Tech Mediagate. Most media enclosures are still just offering USB interfaces, which is really not that convenient.
Wireless access to the media drive is of course the best. You can place it in your living room and update the videos or audio files remotely from you PC without wiring your place or having to invest in a wireless adapter.
The MVIX Multimedia Player MV-5000U is actually sold in the United States. But that model still only comes with USB. See the MVIXStore site for more details. I hope Unicorn Information Systems (site) sees the potential and will bring their wireless enclosure to the US market soon. Update: MVIX USA expects the product to hit the US market in July or August.



MVIX Wireless HDD Enclosure Features:

• Specifications
  • Video playback :
    • Codec: MPEG 1/2/4, WMV 9 Divx, Xvid
    • Format: WMV, avi, mpg, vob, MP4, asf, tp, trp, ISO
    • Resolution: up to 1,080i
  • Audio playback:
    • MP3, WMA, AAC, Ogg, PCM, AC3
    • DTS decoding including down-mixing, DTS pass through
  • Image playback: BMP, JPEG, PNG
  • Video output: composite, S-video, component, DVI
  • Audio output:
    • Analog: stereo RCA, 5.1 channel RCA
    • Digital: coaxial, optical
  • Networking: ethernet (10/100), wireless LAN (802.11g or Pre-N MIMO)
  • Extended port: USB 2.0 host x 2 port, EX-IR
  • Main processor: SEM8621L (by sigma designs)
  • Flash memory: 8M byte
  • RAM: 64M byte (DDR)
  • Power supply: external power adapter
• Features
  • Multimedia contents playback: movie, picture and music contents playback
  • Hardware video decoder for multiple formats: support MPEG-2, MPEG4 and WMV9
  • HD Decoding:
    • 1,080i (MPEG-2) or 720p (MPEG-4, WMV9)
    • WMV, ASF, AVI and MP4 formats
    • MPEG-2 MPat HL(720P/1,080I)MPEG-4 ASPat L5 (720p) and WMV9 MPat ML (720p)
  • Support Portable Storage:
    • HDD or memory device supporting USB 2.0 host
    • Directly connect to the player and play all contents in the storage
    • 3.5" HDD type encloser
  • Video output ports: composite, S-VHS, components and DVI
  • Audio decoding and output ports:
    • Stereo RCA, Digital Audio Output
    • (coaxial and optical, DTS pass-through)
    • DTS decoding including down-mixing
    • Audio DSP supports dolby digital, MPEG-1 and MPEG-2 Layers I, II and III (MP3), MPEG-2 BC multi-channel layers I, II and III, MPEG-2 and MPEG-4 AAC-LC,WMA9 and WMA9 Pro decoding
  • Networking:
  • Ethernet (10/100) or W-LAN (802.11g)
  • Play all contents in PCs or network storage through LAN
  • Operating system: uc linux
  • Picture slideshow: JPEG, BMP and PNG formats
  • Video playback features:
    • Play/pause, FF/RWD (x2/4/8/16/32 speed) and 10sec previous/next
    • Zoom-in, bookmark
  • Configuration: brightness, contrast, hue and saturation
  • Slide show with background music
  • Firmware update through internet