The GTA:San Andreas multiplayer server was updated to SA:MP 0.1b yesterday.
The server is available in the game browser as 'Driving miss Kdjac - iol.ie' or you can connect directly to 193.120.123.136:7777
You can download the multiplayer client here.
Note: This will only only work with version 1.0 of GTA:San Andreas since Rockster introduced measures to limit mods. So if you have a later version you'll have to be a bit *ahem* creative when you apply the mod.
If you have comments about the server get in contact with either kdjac or jackass on boards.ie.