The first post SP1 cumulative update is available. We would recommend to install SP1 and then the June CU to be on the latest bits.
Link list where you can find SP1 resources:
List of all SharePoint 2010 and Office Server 2010 SP1 packages
Office 2010 and SharePoint 2010 Service Pack 1 Availability
White paper for SharePoint Foundation 2010 (MSF2010) SP1
White paper for SharePoint Server 2010 (SPS2010) SP1
The June CU:
12/July/2011; Update; Important: please also check the post from my colleague Stefan Gossner:
2536601 The full server package for Microsoft SharePoint Foundation 2010
2536599 The full server package for SharePoint Server 2010 and contains also the MSF2010 fixes so you need only this one package.
Important for all Server Applications listed above:
After applying the preceding updates, run the SharePoint Products and Technologies Configuration Wizard or “psconfig –cmd upgrade –inplace b2b -wait” in command line. This needs to be done on all servers in the farm with SharePoint installed. You can run psconfig in parallel on all SharePoint machines.