This is what Sebastiaan Janssen uses to list the latest blog posts. Change the numberOfPosts variable to decide how many you want to show
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp " "> ]>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:msxml="urn:schemas-microsoft-com:xslt"
xmlns:umbraco.library="urn:umbraco.library" xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon" xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes" xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath" xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions" xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings" xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets" xmlns:tagsLib="urn:tagsLib" xmlns:BlogLibrary="urn:BlogLibrary"
exclude-result-prefixes="msxml umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings Exslt.ExsltSets tagsLib BlogLibrary ">
<xsl:output method="xml" omit-xml-declaration="yes"/>
<xsl:param name="currentPage"/>
<xsl:variable name="numberOfPosts" select="3"/>
<xsl:template match="/">
<xsl:for-each select="$currentPage/ancestor-or-self::node //node[@nodeTypeAlias = 'BlogPost']">
<xsl:sort select="@createDate" order="descending" />
<xsl:if test="position() = 1">
<h2>Latest blog posts</h2>
</xsl:if>
<xsl:if test="position() <= $numberOfPosts">
<p><a href="{umbraco.library:NiceUrl(@id)}"><xsl:value-of select="@nodeName"/></a></p>
</xsl:if>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>