Snowleopard due this year - and for Intel Macs only. So I won't be upgrading to 10.6;
I've since put Leopard on an external drive and loaded the latest version. But I'll need to upgrade quite a few apps before I can use it fully.
PowerMac G5, 2.7DP, 8Gb RAM; OSX 10.4.11 and 10.5.8 (on separate drives). (Also a PowerMac 7300 that's still running Quark 4.1 on OS 8.6 ...)