This is the code I used to restyle the blog posts in the Education Starter Kit that is found in the Sitefinity SDK

gistfile1.ascx

<%@ Control Language="C#" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.Comments" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI.ContentUI" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="sf" Namespace="Telerik.Sitefinity.Web.UI" Assembly="Telerik.Sitefinity" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
<%@ Import Namespace="Telerik.Sitefinity" %>	
<%@ Register TagPrefix="cc1" Namespace="SitefinityWebApp.Tools" Assembly="SitefinityWebApp" %>

<telerik:RadListView ID="Repeater" ItemPlaceholderID="ItemsContainer" runat="server" EnableEmbeddedSkins="false" EnableEmbeddedBaseStylesheet="false">
    <LayoutTemplate>
        <ul class="sfpostsList">
            <asp:PlaceHolder ID="ItemsContainer" runat="server" />
        </ul>
    </LayoutTemplate>
    <ItemTemplate>
        <li class="sfpostListItem">
            <h2 class="sfpostTitle">
                <sf:DetailsViewHyperLink TextDataField="Title" ToolTipDataField="Description" runat="server" />
            </h2>
            <p class="sfgenericAuthorAndDate">
                <asp:Literal ID="Literal2" Text="<%$ Resources:Labels, By %>" runat="server" /> 
                <sf:PersonProfileView runat="server" />
                <sf:FieldListView ID="PostDate" runat="server" 
                    Format=" | {PublicationDate.ToLocal():dd MMM, yyyy}" 
                />
            </p>

            <div class="sfPostContent">
                <cc1:Truncate Text='<%# Eval("Content")%>' WordLength="100" runat="server" />
            </div>

            <div class="sfPostLink">
                <sf:DetailsViewHyperLink Text="Read More" ToolTipDataField="Description" runat="server" />
            </div>

        </li>
    </ItemTemplate>
</telerik:RadListView>
<sf:Pager id="pager" runat="server" NavigationMode="Links"></sf:Pager>

gistfile2.css

ul.sfpostsList 
{
    padding: 0;
    margin: 0;
    list-style: none;
}

li.sfpostListItem h2.sfpostTitle
{
    padding-bottom: 0;
    margin-bottom: 0;
    border-bottom: none;
    font-size: 1.8em;
}

li.sfpostListItem h2.sfpostTitle a
{
    text-decoration: none;
}

li.sfpostListItem .sfPostContent h2
{
    border-bottom: none;
}

li.sfpostListItem .sfgenericAuthorAndDate
{
    padding: 0;
    margin: 0;
}

li.sfpostListItem .sfPostLink
{
    padding: 7px;
    border-bottom: 1px solid #444;    
    background-color: #f3f3f3;
    margin-bottom: 1.5em;
    font-weight: bold;
    font-size: 1.0em;
}
li.sfpostListItem .sfPostLink a
{
    text-decoration: none;
}

gistfile3.cs

using System.Web.UI.WebControls;
using Telerik.Sitefinity.Data.Summary;

namespace SitefinityWebApp.Tools
{
    public class Truncate : Literal
    {

        /// <summary>
        /// Determines how many words the Text will be truncated to.  Sitefinity will preserve the HTML.
        /// </summary>
        public int WordLength
        {
            get
            {
                return _wordlength;
            }
            set
            {
                _wordlength = value;
            }
        }

        /// <summary>
        /// This is used for backwards compatibility.  The first version of Truncate only had the Length property.
        /// </summary>
        public int Length
        {
            get
            {
                return WordLength;
            }
            set
            {
                WordLength = value;
            }
        }

        protected override void CreateChildControls()
        {

            var settings = new SummarySettings(SummaryMode.Words, WordLength, false);
            Text = SummaryParser.GetSummary(Text, settings);
            base.CreateChildControls();
        }

        private int _wordlength = 20;

    }
}