Servers - Partition map best practices?

Hiya linuxadmin,

I'm re-building some infrastructure at work, and I've got a question about what the current best practice for system drive partitioning is. I know at minimum I need a /boot, / and (swap), but I believe it's best to have /tmp, /var/log and any services (e.g. /var/lib/mysql) in their own partition, right? (In fact, I usually create separate virtual drives for mysql/postgres in VMware and mount them there). Or, is it better to quota those directories somehow these days? Also, what sort of sizes would people recommend these days?

These are all virtual guests with a SAN, so drive structure really isn't an issue here.

edit: Also - LVM or not?