It would be great if that project would become a package one day :-)

Anyhow, within the View, you could do like this:

@inherits Umbraco.Web.Mvc.UmbracoTemplatePage
@{
    Layout = "SiteMasterView.cshtml";
    var childpage = CurrentPage;
}
<section id="page-content">

    @Html.Raw(TruncateAtWord(Umbraco.StripHtml(childpage.bodyText).ToString(),70))

</section>            

@functions
{
    public static string TruncateAtWord(string textToTruncate, int length)
    {
        if (textToTruncate == null || textToTruncate.Length < length)
            return textToTruncate;
        int iNextSpace = textToTruncate.LastIndexOf(" ", length);
        return string.Format("{0}...", textToTruncate.Substring(0, (iNextSpace > 0) ? iNextSpace : length).Trim());
    }
}