As you probably already know, ConfigMgr 2011 (v.Next) uses SQL Replication to pass data between sites ...

I've been troubleshooting SQL 2008 Replication, and found a few interesting links that might help grow out your skills in this area if you're not already above novice-level :-)

Here is SQL Server Replication exposed on MSDN in all its glory: http://msdn.microsoft.com/en-us/library/ms151198.aspx

Here are a collection of links on troubleshooting from MSDN:

http://msdn.microsoft.com/en-us/library/ms151756.aspx

http://msdn.microsoft.com/en-us/library/ms151746.aspx

http://msdn.microsoft.com/en-us/library/ms151872.aspx

http://msdn.microsoft.com/en-us/library/ms152505.aspx

Alexander Chigrik has a write up on SQL Replication troubleshooting ... http://www.databasejournal.com/sqletc/article.php/1468971/Troubleshooting-Replication-Problems.htm - Not sure how appropriate this to the way ConfigMgr expects SQL replication to be configured so be careful what you change, and only use this guide by Alexander to identify existing faults rather than using it to define a standard group of settings for SQL (read the article, you'll understand)

Read the complete post at http://wmug.co.uk/blogs/r0b/archive/2010/06/11/configmgr-2011-sql-replication-troubleshooting.aspx