It seems that under this weird circumstance, the GPU miner should be released.
Here it is:
Prebuilt binary for windows 64:
http://sourceforge.net/projects/hnindev/files/yaminer-beta-winx64.zip
Source code for compiling under linux or win32
http://sourceforge.net/projects/hnindev/files/yaminer-beta-src.zip, (not fully tested, because under linux I used a older version of cgminer)

It's based on the cgminer scrypt mining, but there's some difference, the lookup-gap=2 + thread-concurrency parameters are just used to for allocate the pad buffer. The intensity (I) means the global work size 2^I, it seems to be related to the Nfactor & GPU stream cores & GPU memory size. For the GCN GPUs, set the worksize to 256 and for the pre-GCN GPUs, set the worksize to 64.

Some typical command lines:
For 5950
cgminer --device 0 --scrypt --worksize 64 --lookup-gap 2 -I 11 --thread-concurrency 8192 -o -u -p
Currently can hash 190KH/s (Nfactor=9)

For 6750
cgminer --device 0 --scrypt --worksize 64 --lookup-gap 2 -I 10 --thread-concurrency 2816 -o -u -p
Currently can hash 47KH/s (Nfactor=9)

For 7950
cgminer --device 0 --scrypt --worksize 256 --lookup-gap 2 -I 12 --thread-concurrency 32768 -o -u -p
Currently can hash 230KH/s (Nfactor=9)

When running under linux, maybe you need to set these environment variables:
export DISPLAY=:0
export GPU_MAX_ALLOC_PERCENT=100
export GPU_USE_SYNC_OBJECTS=1

PS, my GPU miner is not quite fast comparing to some others, and it may not work for some other cards.