Hi there, I thought I should stop by , register and post that I am happy using bblean 1.17.1 x64 version vanilla from the official site under windows 8.1 x64 professional.
So far so good. I am not using bbleanbar(it's toggled off, I cannot stand anything wasting screen estate I am not looking at), toggled off BBanalog clock, only a small traybar in some corner of the screen to see from time to time if i got skype, utorrent, miranda, whatever already open. I use launchy mostly to launch my apps, windows+run dialog sometimes and I will eventually dump launchy for FARR(find I run robot).
Utter minimalism! BBlean is 7.9Mb in task manager
And one last note you will be shocked to hear how I returned now in 2014 (Happy New Year!) to bblean : I couldn't stand windows tasbkar, visible or not(with the fact that hidden was even worse overlapping other windows). The fact that Macrosoft wouldn't let me disable it. I knew what I had to do. Dump the taskbar's mother altogether as a shell. Use another, use bblean which sat patiently on my data partition for times like these.
Keep it Up! and I encourage more people to use it.