That would be the 990FX/990X/970 chipsets. They can do SLI and CrossFire at x16/x16, and they support current Phenom II CPUs as well as future Bulldozer CPUs.
If you're not worried about SLI and don't want to wait, you could also go for an 890 FX Motherboard with the AM3+ socket right now and get more or less the same for a lower price...