The latest news on x10 mini pro firmwares over at XDA are as follows:
MiniCM7 Pro v16 – Mini pro port of MiniCM which is based on Cyanogen(mod) 7
GinTonic.SE | v2.1 – revival of GinTonic, Gingerbread 2.3.5
V15 ArcMini V6 [For Custom Kernels] – a themed version of MiniCM based on GingerDX
MOD BlackS v 1.6 – a heavily themed version from the Clean-Projekt (based on stock firmware)
OnE-DROID HD – Another firmware based on MiniCM7 (v12)
If you’re not up to date, or starting out from scratch here’s the best place to get your device rooted and a recovery installed:
ClockWorkMod Installer – Windows v4, Linux v4 – for Windows users it’s all self contained in the zip file, Linux users need to root first; there are links to the Linux Rooter in the thread.
If you’ve tested or use any of the firmware listed please give feedback to other users via the comments.