We have rtl8180, rtl8187.... why miss the poor 8185 ? Tnx in advance for any ebuild! ;-)
I think that rtl8187 supports also rtl8285. Both rtl drivers in portage (rtl8187 and rtl8180) doesn't work for recent kernels but there is a project here: http://rtl-wifi.sourceforge.net/wiki/Main_Page aimed at giving full support to all rtl wireless chipsets.
rtl8185 is supported in the mainline kernel, as of kernel-2.6.25 (I have it running on 2.6.26 anyway)