I've been using SQL Server Compact Toolbox and ErikEJ's ExportSQLCe commandline tools a lot recently. Ran into some problems converting my SQL 2008 R2 schema + data to Compact. I posted the issue just this week and within a day Erik had chatted with me and subsequently added a few new features that specifically addressed my needs. I do a lot of OCA/Sync applications and these tools have been an immense help in speeding up my process.