SharePoint 2010 has been stable and feature-rich platform, Microsoft recently released Service Pack 1 for it.
There are questions regarding its performance and appreciation regarding the bugs fixed. 

What's new in SharePoint 2010 SP1
First, here is what SharePoint 2010 SP1 adds:

• Support for SQL Server "Denali" (aka SQL Server 2011): Given that SharePoint is heavily integrated with SQL, it stands to reason that new features in the forthcoming Denali version of SQL Server will only make SharePoint 2010 better.
• Shallow Copy: This new feature allows you to move site collections to new content databases without having to move all the Remote Blob storage content. Thus, only the ownership information is moved, without having to copy the unstructured data in the file store. The Move-SPSite PowerShell cmdlet has been enhanced to allow this feature.
• Site Recycle Bin: With this new feature, administrators can restore site collections and/or sites that have been accidentally deleted by their owners. How often does this happen? Hopefully not too often. But when it does, having recoverable copies without getting out backups is a plus. We've had the Recycle Bin feature in SharePoint for lists, libraries, and documents for while now; this is a nice additional safety net.
• StorMan.aspx (Storage Space Allocation page): StorMan.aspx has been reintroduced in SharePoint 2010 SP1. It was removed from the original version of SharePoint 2010. Now that it is back, it adds the ability to display better information to users regarding their quota information. That makes it easier for users to clean up their sites by deleting content they may not need.
• Cascading filters in PerformancePoint Services: Filters values can now be passed from one filter to the next.
• Broader browser support: SharePoint 2010 SP1 adds support for IE9 in Internet Explorer 8 Standards Mode, as well as for Google Chrome.

Other Languages

This article is also available in the following languages

• Norwegian: SharePoint 2010 Service Pack 1: What it Does and What it Does Not Do (nb-NO)