Patch to add speaker notes to the Go present tool (lines beginning with ">"; in the web UI, toggle display with 'n'). Works on all slides but the title slide. Breaks if you have more than one contiguous run of lines starting with "> " in a single slide (due to CSS). I'll submit a real patch upstream soon (unless someone else volunteers).

golang-present-speaker-notes.diff

diff -r 5b025577f8ab cmd/present/static/slides.js
--- a/cmd/present/static/slides.js	Fri Jun 13 12:42:11 2014 +1000
+++ b/cmd/present/static/slides.js	Fri Jun 13 06:09:06 2014 -0700
@@ -10,6 +10,8 @@
 
 var curSlide;
 
+var showNotes;
+
 /* ---------------------------------------------------------------------- */
 /* classList polyfill by Eli Grey
  * (http://purl.eligrey.com/github/classList.js/blob/master/classList.js) */
@@ -214,6 +216,18 @@
   }
 };
 
+/* Note functions */
+
+function toggleNotes() {
+  document.body.classList.toggle('notes-visible');
+  showNotes = !showNotes;
+  updateHash();
+}
+
+function getShowNotesFromHash() {
+  return location.hash.indexOf('-notes') !== -1;
+};
+
 /* Slide events */
 
 function triggerEnterEvent(no) {
@@ -380,7 +394,7 @@
 };
 
 function updateHash() {
-  location.replace('#' + (curSlide + 1));
+  location.replace('#' + (curSlide + 1) + (showNotes ? '-notes' : ''));
 };
 
 /* Event listeners */
@@ -418,6 +432,10 @@
       prevSlide();
       event.preventDefault();
       break;
+
+    case 78: // 'n'
+      if (inCode) break;
+      toggleNotes();
   }
 };
 
@@ -474,6 +492,7 @@
   addPrintStyle();
   addEventListeners();
 
+  if (getShowNotesFromHash()) toggleNotes();
   updateSlides();
 
   setupInteraction();
diff -r 5b025577f8ab cmd/present/static/styles.css
--- a/cmd/present/static/styles.css	Fri Jun 13 12:42:11 2014 +1000
+++ b/cmd/present/static/styles.css	Fri Jun 13 06:09:06 2014 -0700
@@ -415,6 +415,52 @@
   bottom: 5px;
 }
 
+/* Notes */
+
+.note {
+  display: none;
+
+  padding: 40px 50px;
+
+  background-color: rgb(255, 255, 230);
+
+  border: solid 1px rgb(215, 215, 215);
+  border-radius: 10px;
+  -o-border-radius: 10px;
+  -moz-border-radius: 10px;
+  -webkit-border-radius: 10px;
+
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+}
+
+.note p {
+  margin-bottom: 15px;
+}
+
+.note p:last-child {
+  margin-bottom: 0;
+}
+
+body.notes-visible {
+  zoom: 0.60;
+}
+
+body.notes-visible .note {
+  display: block;
+}
+
+body.notes-visible .slides > article {
+  overflow: visible;
+  top: 25%;
+}
+
+body.notes-visible .slide-area {
+  top: 25%;
+}
+
 /* Presenter details */
 .presenter {
 	margin-top: 20px;
diff -r 5b025577f8ab cmd/present/templates/action.tmpl
--- a/cmd/present/templates/action.tmpl	Fri Jun 13 12:42:11 2014 +1000
+++ b/cmd/present/templates/action.tmpl	Fri Jun 13 06:09:06 2014 -0700
@@ -31,6 +31,15 @@
   <div class="code{{if playable .}} playground{{end}}" contenteditable="true" spellcheck="false">{{.Text}}</div>
 {{end}}
 
+{{define "note"}}
+  <div class="note">
+    <p>
+      {{range $i, $l := .Lines}}{{if not $l}}</p><p>{{end}}
+      {{style $l}}{{end}}
+    </p>
+  </div>
+{{end}}
+
 {{define "image"}}
 <div class="image">
   <img src="{{.URL}}"{{with .Height}} height="{{.}}"{{end}}{{with .Width}} width="{{.}}"{{end}}>
diff -r 5b025577f8ab cmd/present/templates/slides.tmpl
--- a/cmd/present/templates/slides.tmpl	Fri Jun 13 12:42:11 2014 +1000
+++ b/cmd/present/templates/slides.tmpl	Fri Jun 13 06:09:06 2014 -0700
@@ -27,12 +27,12 @@
   {{range $i, $s := .Sections}}
   <!-- start of slide {{$s.Number}} -->
       <article>
-      {{if $s.Elem}}
-        <h3>{{$s.Title}}</h3>
-        {{range $s.Elem}}{{elem $.Template .}}{{end}}
+      {{if $s.TitleOnly}}
+      <h2>{{$s.Title}}</h2>
       {{else}}
-        <h2>{{$s.Title}}</h2>
+      <h3>{{$s.Title}}</h3>
       {{end}}
+      {{range $s.Elem}}{{elem $.Template .}}{{end}}
       </article>
   <!-- end of slide {{$i}} -->
   {{end}}{{/* of Slide block */}}
diff -r 5b025577f8ab present/parse.go
--- a/present/parse.go	Fri Jun 13 12:42:11 2014 +1000
+++ b/present/parse.go	Fri Jun 13 06:09:06 2014 -0700
@@ -124,6 +124,17 @@
 	return b.String()
 }
 
+// TitleOnly returns true if the section contains only a title and (optionally)
+// notes, and false otherwise.
+func (s Section) TitleOnly() bool {
+	for _, e := range s.Elem {
+		if _, ok := e.(Note); !ok {
+			return false
+		}
+	}
+	return true
+}
+
 func (s Section) TemplateName() string { return "section" }
 
 // Elem defines the interface for a present element. That is, something that
@@ -168,6 +179,13 @@
 
 func (t Text) TemplateName() string { return "text" }
 
+// Note represents notes about a slide.
+type Note struct {
+	Lines []string
+}
+
+func (n Note) TemplateName() string { return "note" }
+
 // List represents a bulleted list.
 type List struct {
 	Bullet []string
@@ -358,6 +376,14 @@
 					return nil, err
 				}
 				e = t
+			case strings.HasPrefix(text, "> "):
+				var l []string
+				for ok && strings.HasPrefix(text, ">") {
+					l = append(l, strings.TrimSpace(text[1:]))
+					text, ok = lines.next()
+				}
+				lines.back()
+				e = Note{Lines: l}
 			default:
 				var l []string
 				for ok && strings.TrimSpace(text) != "" {