SharePoint Version Comparision

Today I came across excellent link about comparision on different version of SharePoint 2010.Hope Link will be usefull for you all also

http://www.apps4rent.com/SharePoint-Hosting/Comparison-SharePoint-Foundation-vs-Server-2010.html

How to make contentplaceholder read only?

We can make content place holder in Master Page Read only by putting ControlMode="Display"

<SharePointWebControls:DateTimeField FieldName="RenewalDate" runat="server" id="DateTimeField1" ControlMode="Display">

Difference between siteCollection.AllWebs and siteCollection.OpenWeb

siteCollection.AllWebs: Returns all the webs within site collection,It is a sharepoint property. for example If you wish to inherit same master page in all subsite in site collection, you can use this property.

siteCollection.OpenWeb: It is method and take SPWeb as parameter. It used to access particular web within site collection.