Running on Debian Wheezy amd64 with latest updates on a core-i7 system. After satisfying the library dependencies, the steam GUI comes up for a few seconds, but then crashes with:

Installing breakpad exception handler for appid(steam)/version(1355957371_client)
[0106/145552:WARNING:backend_impl.cc(1644)] Messed up entry found.
[0106/145552:WARNING:backend_impl.cc(1930)] Destroying invalid entry.
System startup time: 7.10 seconds
[0106/145552:WARNING:backend_impl.cc(1930)] Destroying invalid entry.
[0106/145552:WARNING:backend_impl.cc(1930)] Destroying invalid entry.
[0106/145552:WARNING:backend_impl.cc(1930)] Destroying invalid entry.
Uploading dump (in-process) [proxy '']
/tmp/dumps/crash_20130106145552_1.dmp
ExecSteamURL: "steam://open/driverhelperready"
success = yes
response:  CrashID=bp-af4fa9e4-d274-4067-abb8-765982130106
/home/jon/.local/share/Steam/steam.sh: line 287:  5582 Bus error               $DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"

Steam still works fine under wine. Here is my system info under wine:

Processor Information:
    Vendor:  GenuineIntel
    Speed: 1600 Mhz
    8 logical processors
    4 physical processors
    HyperThreading:  Supported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Supported
    SSE42:  Supported

Network Information:
    Network Speed:  

Operating System Version:
    Windows XP (32 bit)
    Wine version: wine-1.4.1
    NTFS:  Supported
    Crypto Provider Codes:  Supported 311 0x0 0x0 0x0

Video Card:
    Driver Not Detected

    DirectX Driver Name:  nv4_disp.dll
    Driver Version Not Detected
    DirectX Driver Version:  6.15.12.6658
    Driver Date Not Detected
    DirectX Card: NVIDIA GeForce GTS 450
    VendorID:  0x10de
    DeviceID:  0xdc4
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    No SLI or Crossfire Detected
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 1920 x 1080
    Primary Display Size: 20.00" x 11.26"  (22.91" diag)
                                            50.8cm x 28.6cm  (58.2cm diag)
    Primary Bus Type Not Detected
    Primary VRAM Not Detected
    Supported MSAA Modes:  2x 3x 4x 5x 6x 7x 8x 9x 10x 11x 12x 13x 14x 15x 16x 

Sound card:
    Audio device: 

Memory:
    RAM:  16068 Mb