I've been running the released 0.6.0.6-beta Windows version for a few days without issue. This morning I see that it had crashed.
AcceptToMemoryPoolUnchecked(): size 165
AcceptToMemoryPool(): accepted 6782e85f04
askfor tx 6aa3f5bd2139496e20ca 0
sending getdata: tx 6aa3f5bd2139496e20ca
askfor tx 6aa3f5bd2139496e20ca 1333775791000000
AcceptToMemoryPoolUnchecked(): size 166
AcceptToMemoryPool(): accepted 6aa3f5bd21
askfor tx 69c0e4718003450f04d7 0
sending getdata: tx 69c0e4718003450f04d7
askfor tx 69c0e4718003450f04d7 1333775793000000
AcceptToMemoryPoolUnchecked(): size 167
AcceptToMemoryPool(): accepted 69c0e47180
Added 1 addresses from 216.245.210.212: 45 tried, 12819 new
Added 1 addresses from 208.118.235.153: 45 tried, 12820 new
************************
EXCEPTION: St9bad_alloc
std::bad_alloc
C:\path\to\bitcoin\bitcoin-qt.exe in ThreadDumpAddress()