diff --git a/extra/spider/report/authors.txt b/extra/spider/report/authors.txt
new file mode 100644
index 0000000000..d4f5d6b3ae
--- /dev/null
+++ b/extra/spider/report/authors.txt
@@ -0,0 +1 @@
+Slava Pestov
\ No newline at end of file
diff --git a/extra/spider/report/report.factor b/extra/spider/report/report.factor
new file mode 100644
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+++ b/extra/spider/report/report.factor
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+! Copyright (C) 2009 Slava Pestov.
+! See http://factorcode.org/license.txt for BSD license.
+USING: accessors arrays assocs combinators kernel math
+math.statistics namespaces sequences sorting xml.syntax
+spider ;
+IN: spider.report
+
+SYMBOL: network-failures
+SYMBOL: broken-pages
+SYMBOL: timings
+
+: record-broken-page ( url spider-result -- )
+    headers>> [ code>> ] [ message>> ] bi 2array 2array
+    broken-pages push ;
+
+: record-page-timings ( url spider-result -- )
+    fetch-time>> 2array timings get push ;
+
+: record-network-failure ( url -- )
+    network-failures get push ;
+
+: process-result ( url spider-result -- )
+    {
+        { f [ record-network-failure ] }
+        [
+            dup headers>> code>> 200 =
+            [ record-page-timings ] [ record-broken-page ] if
+        ]
+    } case ;
+
+CONSTANT: slowest 5
+
+SYMBOL: slowest-pages
+SYMBOL: mean-time
+SYMBOL: median-time
+SYMBOL: time-std
+
+: process-timings ( -- )
+    timings get sort-values
+    [ slowest short tail* reverse slowest-pages set ]
+    [
+        values
+        [ mean 1000000 /f mean-time set ]
+        [ median 1000000 /f median-time set ]
+        [ std 1000000 /f time-std set ] tri
+    ] bi ;
+
+: process-results ( results -- )
+    V{ } clone network-failures set
+    V{ } clone broken-pages set
+    V{ } clone timings set
+    [ process-result ] assoc-each
+    process-timings ;
+
+: info-table ( alist -- html )
+    [
+        first2 dupd 1000000 /f
+        [XML
+        <tr><td><a href=<->><-></a></td><td><-> seconds</td></tr>
+        XML]
+    ] map [XML <table border="1"><-></table> XML] ;
+
+: report-broken-pages ( -- html )
+    broken-pages get info-table ;
+
+: report-network-failures ( -- html )
+    network-failures get [
+        dup [XML <li><a href=<->><-></a></li> XML]
+    ] map [XML <ul><-></ul> XML] ;
+
+: slowest-pages-table ( -- html )
+    slowest-pages get info-table ;
+
+: timing-summary-table ( -- html )
+    mean-time get
+    median-time get
+    time-std get
+    [XML
+    <table border="1">
+    <tr><th>Mean</th><td><-> seconds</td></tr>
+    <tr><th>Median</th><td><-> seconds</td></tr>
+    <tr><th>Standard deviation</th><td><-> seconds</td></tr>
+    </table>
+    XML] ;
+
+: report-timings ( -- html )
+    slowest-pages-table
+    timing-summary-table
+    [XML
+    <h2>Slowest pages</h2>
+    <->
+
+    <h2>Summary</h2>
+    <->
+    XML] ;
+
+: generate-report ( -- html )
+    report-broken-pages
+    report-network-failures
+    report-timings
+    [XML
+    <h1>Broken pages</h1>
+    <->
+
+    <h1>Network failures</h1>
+    <->
+
+    <h1>Load times</h1>
+    <->
+    XML] ;
+
+: spider-report ( spider -- html )
+    [ spidered>> process-results generate-report ] with-scope ;