PhoenixMiner 2.8c is officially released. Note that there are changes since 2.8b, so if you are running 2.8b, you should upgrade to this version. Here is the full list of changes since 2.7c (the last official release):

• New kernels for all supported AMD GPUs, providing higher hashrate and lower percentage of stale shares. The new kernels are used by default for AMD GPUs. You can also revert to using the old kernels with -clnew 0
• When using the new kernels, the mining intensity is 12 by default instead of 10
• The mining intensity range is now up to 14. Use high -mi only with the new AMD kernels as for the other kernels the stale shares will increase too much
• Small CUDA kernel stability improvements that also may (very) slightly increase the speed of Nvidia cards
• CPU utilization during normal operation is lowered by about a factor of 10 regardless of the number of GPUs
• Added support for -tstop and -tstart options to stop mining on given GPU if the temperature rise above specified value and restart it after it cools down below -tstart temperature
• Fixed the problem with console window freezing after scrolling
• Implemented new -gpow n option to lower the GPU utilization (default: 100, the value is the desired GPU utilization in percent)
• Implemented the -li option to lower the intensity (use this instead of -gpow if you are already using -mi with low values)
• Improved GPU speed statistics, using moving average window for each GPU. You can change the size of the window with the -gswin option (5-30 seconds; default 15; use 0 to revert to the old way of using 5 second "quants" which are independent of each other)
• Specify GPU number above 9 by typing three-digit sequence at the console (e.g. type 011 to pause or resume GPU11)
• Other small improvements and changes
• Added support for the miner_getstat2 remote monitoring request

We are now working on 2.9, which will include new CUDA kernels for Nvidia GPUs and other improvements.