Gulpfile.js Sample, latest

gistfile1.js

// Load plugins
var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    rename = require('gulp-rename'),
    notify = require('gulp-notify'),
    concat = require('gulp-concat'),
    uglify = require('gulp-uglify'),
    markdown = require('gulp-markdown'),
    jade = require('gulp-jade'),
    imagemin = require('gulp-imagemin'),
    cache = require('gulp-cache'),
    livereload = require('gulp-livereload'),
    lr = require('tiny-lr'),
    server = lr();

// Styles
gulp.task('styles', function() {
    return gulp.src('./scss/style.scss')
        .pipe(sass({
            style: 'expanded',
            compass: true,
            require: ['susy']
        }))
        .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
        .pipe(gulp.dest('./build/css'))
        .pipe(rename({ suffix: '.min' }))
        .pipe(minifycss())
        .pipe(gulp.dest('./build/css'))
        .pipe(livereload(server))
        .pipe(notify({ message: 'Styles task complete' }));
});

// Converts Markdown to HTML
gulp.task('markdown', function () {
    return gulp.src('./jade/md/*.md')
        .pipe(markdown())
        .pipe(gulp.dest('./jade/md/'))
        .pipe(notify({ message: 'Markdown to HTML task complete' }));
});

// Converts Jade to HTML (jade is including markdown files)
gulp.task('jade', ['markdown'], function() {  // ['markdown'] forces jade to wait
    return gulp.src('./jade/*.jade')
        .pipe(jade({
            pretty: true,  // uncompressed
        }))
        .pipe(gulp.dest('./'))
        .pipe(livereload(server))
        .pipe(notify({ message: 'Jade to HTML task complete' }));
});

// Concatenate & Minify JS
gulp.task('scripts', function() {
    return gulp.src('js/*.js')
        .pipe(concat('scripts.js'))
        .pipe(gulp.dest('./build/js'))
        .pipe(rename('scripts.min.js'))
        .pipe(uglify())
        .pipe(gulp.dest('./build/js'))
        .pipe(notify({ message: 'JS task complete' }));
});

// Images
gulp.task('images', function() {
    return gulp.src('./images/**/*')
        .pipe(cache(imagemin({ optimizationLevel: 5, progressive: true, interlaced: true })))
        .pipe(gulp.dest('./build/images'))
        .pipe(livereload(server))
        .pipe(notify({ message: 'Images task complete' }));
});

// Default task
gulp.task('default', ['styles', 'scripts', 'images', 'markdown', 'jade', 'watch']);

// Watch
gulp.task('watch', function() {

    // Listen on port 35729
    server.listen(35729, function (err) {
        if (err) {
        return console.log(err);
    }

    // Watch .scss files
    gulp.watch('scss/**/*.scss', ['styles']);

    // Watch .js files
    gulp.watch('js/**/*.js', ['scripts']);

    // Watch image files
    gulp.watch('images/**/*', ['images']);

    // Watch .md files
    gulp.watch('jade/md/*.md', ['jade']);  // triggers jade task when markdown file changes

    // Watch .jade files
    gulp.watch('jade/**/*.jade', ['jade']);

    });

});

Updated, added .jade and .md support, took me a awhile to get it working with livereload. I had a problem where when markdown files were updated, livereload wouldn't update. This was because I needed to call the jade task instead, which runs the markdown task first, good to know this shit I guess, took me a while to figure it out.

This gist looks interesting... but, are you passing markdown to jade template? How are you doing it?