Adding a stylesheet to a SharePoint masterpage using the CSSRegistration control

Sharepoint has a .NET control for registering CSS files in a SharePoint masterpage called SharePoint:CSSRegistration. Use the ~Site token to specify the current site. This control goes in the head section of the masterpage.

<SharePoint:CssRegistration name="<% $SPUrl:~Site/CSS/gilariver.css%>" runat="server"/>

New to SharePoint 2010
You can specify the order using the After property. The After property contains the name of the CSS that you want to place the CSS after. The ConditionalExpression parameter will tell the CssLink to render the Conditional-CSS code as well as the CSS link.

Using the RadCaptcha control

RadControls has a RadCaptcha control that can be used in .NET applications or SharePoint web parts. Add the RadCaptcha image handler to the web.config file to use the captcha:

<system.webServer>
...
<handlers>
...
<add name="Telerik.Web.UI.WebResource" path="Telerik.Web.UI.WebResource.axd" verb="*" type="Telerik.Web.UI.WebResource, Telerik.Web.UI, Version=2010.3.1317.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" />
...
</handlers>
</system.webServer>

SharePoint List displayed in XML using OWSSVR.dll

OWSSVR.dll will, among other functions, return the XML data of a SharePoint List. The format of this utility is:

http://yourserver/yourweb/_vti_bin/owssvr.dll?Cmd=Display&List={guid}&XMLDATA=TRUE

http://webcs10.cgc.maricopa.edu/student-affairs/athletics/athletics/_vti_bin/owssvr.dll?Cmd=Display&List=5C1E1425%2D8F8E%2D4427%2D8B4A%2D1A97748B4AD6&XMLDATA=TRUE

More information can be found here:

http://msdn.microsoft.com/en-us/library/ms478653.aspx