diff --git a/NAnt.build b/NAnt.build
index c237bbfdd..bc167b6ad 100644
--- a/NAnt.build
+++ b/NAnt.build
@@ -7,7 +7,7 @@
     <!-- global project settings -->
     <property name="project.name" value="nant" />
     <property name="project.version" value="0.91" unless="${property::exists('project.version')}" />
-    <property name="project.release.type" value="dev" unless="${property::exists('project.release.type')}" /> <!-- nightly | dev | alpha | beta# | rc# | release -->
+    <property name="project.release.type" value="beta1" unless="${property::exists('project.release.type')}" /> <!-- nightly | dev | alpha | beta# | rc# | release -->
 
     <if test="${project.release.type == 'nightly'}">
         <property name="project.version.full" value="${project.version + '-nightly-' + build.date}" />
@@ -26,7 +26,7 @@
         we do not want this for releases (whether they're beta or release) as
         this would cause the build number to be updated
     -->
-    <property name="create.assemblyinfo" value="true" />
+    <property name="create.assemblyinfo" value="false" />
 
     <!-- default configuration -->
     <property name="project.config" value="debug" /> <!-- debug | release -->
diff --git a/doc/releasenotes.html b/doc/releasenotes.html
index 961ee0306..845858474 100644
--- a/doc/releasenotes.html
+++ b/doc/releasenotes.html
@@ -53,6 +53,75 @@ <h1>
                 </td>
             </tr>
         </table>
+		<h2>
+			0.91-beta1 (September 25, 2011)</h2>
+        <h3>Changes</h3>
+        <h4>Core</h4>
+		<div style="margin-left: 20px;">
+			<h5>
+                <a class="heading">App.Config</a></h5>
+            <div style="margin-left: 20px;">
+                <p>
+                    Added mono-4.0 target
+                </p>
+            </div>
+            <div style="margin-left: 20px;">
+                <p>
+                    Added initial support for Silverlight 3 and 4
+                </p>
+            </div>
+            <h5>
+                <a class="heading" href="http://logging.apache.org/log4net/">log4net</a></h5>
+            <div style="margin-left: 20px;">
+                <p>
+                    Upgraded to log4net 1.2.10.
+                </p>
+            </div>
+			<h5>
+                <a class="heading">MSBuild</a></h5>
+            <div style="margin-left: 20px;">
+                <p>
+                    Added initial support for 2008/2010 MSBuild/VS.NET project files.
+                </p>
+            </div>
+		</div>
+        <h3>
+            Bug fixes</h3>
+        <h4>Core</h4>
+        <div style="margin-left: 20px;">
+            <h5>
+                <a class="heading">App.config</a></h5>
+            <div style="margin-left: 20px;">
+                <p>
+                    Added WindowsBase.dll and PresentationFramework.dll to 4.0 target.
+                </p>
+            </div>
+            <h5>
+                <a class="heading">NAnt.xsd</a></h5>
+            <div style="margin-left: 20px;">
+                <p>
+                    Changed the NAnt.Core.Tasks.DescriptionTask task to mixed.
+                    (bug <a href="https://sourceforge.net/tracker/?func=detail&aid=3058913&group_id=31650&atid=402868">#3058913</a>).
+                </p>
+            </div>
+			<h5>
+				<a class="heading">BuildException</a></h5>
+			<div style="margin-left: 20px;">
+				<p>
+					Display correct registry hives in BuildException when Registry Path not found.
+				</p>
+			</div>
+        </div>
+        <h4>Tasks</h4>
+        <div style="margin-left: 20px;">
+            <h5>
+                <a class="heading">ndoc</a></h5>
+            <div style="margin-left: 20px;">
+                <p>
+                    Fixed ndoc task to find hhc.exe for chm generation on 64 bit machines through reflection.
+                </p>
+            </div>
+        </div>
         <h2>
             0.91-alpha2 (August 17, 2010)</h2>
         <h3>
diff --git a/src/CommonAssemblyInfo.cs b/src/CommonAssemblyInfo.cs
index 68d67c9e5..87b6f1548 100644
--- a/src/CommonAssemblyInfo.cs
+++ b/src/CommonAssemblyInfo.cs
@@ -16,7 +16,7 @@
 [assembly: CLSCompliantAttribute(true)]
 [assembly: AssemblyTitleAttribute("NAnt")]
 [assembly: AssemblyDescriptionAttribute("A .NET Build Tool")]
-[assembly: AssemblyConfigurationAttribute("dev")]
+[assembly: AssemblyConfigurationAttribute("beta1")]
 [assembly: AssemblyCompanyAttribute("http://nant.sourceforge.net")]
 [assembly: AssemblyProductAttribute("NAnt")]
 [assembly: AssemblyCopyrightAttribute("Copyright (C) 2001-2011 Gerry Shaw")]