My gulpfile setup

gulpfile.js

var gulp = require('gulp');
var util = require('gulp-util');
var clean = require('gulp-clean');
var browserify = require('gulp-browserify');
var rework = require('gulp-rework');
var prefix = require('gulp-autoprefixer');
var jshint = require('gulp-jshint');
var connect = require('gulp-connect');
var concat = require('gulp-concat');

// unless `--env prod` is passed, it ain't prod
var isProd = util.env.env === 'prod';

// Store these for reuse
var buildDir = 'build';
var jsDir = 'js';
var cssDir = 'css';
var photoDir = 'photos';

// Helpful for watching the same files as being built
var cssFiles = [
	'bower_components/normalize-css/normalize.css',
	cssDir + '/**/*.css'
];
var jsFiles = jsDir + '/main.js';
var htmlFiles = 'html/**/*.html';
var photoFiles = photoDir + '/**/*';

// Mama said knock you out
gulp.task('clean', function() {
	return gulp.src(buildDir, {read: false})
		.pipe(clean());
});

// Copy the simple static files. Shit for local dev, better for packaging & deployment.
gulp.task('html', function() {
	return gulp.src(htmlFiles)
		.pipe(gulp.dest(buildDir));
});

// Gotta do something with the photos
gulp.task('photos', function() {
	return gulp.src(photoFiles)
		.pipe(gulp.dest(buildDir + '/' + photoDir));
});

// Does it pass lint? Use browserify?
gulp.task('js', function() {
	return gulp.src(jsFiles)
		.pipe(jshint())
		.pipe(jshint.reporter('jshint-stylish'))
		.pipe(browserify({
			debug : !isProd
		}))
		.pipe(gulp.dest(buildDir + '/' + jsDir));
});

// Just going with basic rework for now, autoprefixer for, well, that should be obvious
gulp.task('css', function() {
	return gulp.src(cssFiles)
		.pipe(rework(rework.extend(), {
			sourcemap: true
		}))
		.pipe(prefix("last 1 version"))
		.pipe(concat('main.css'))
		.pipe(gulp.dest(buildDir + '/' + cssDir));
});

// Simple static http server
gulp.task('serve', connect({
	root: buildDir
}));

// Build the things
gulp.task('build', ['clean'], function() {
	return gulp.start('html', 'js', 'css', 'photos');
});

// Watch for changes to the files
gulp.task('watch', function() {
	gulp.watch(htmlFiles, ['html']);
	gulp.watch(photoFiles, ['photos']);
	gulp.watch(cssFiles, ['css']);
	gulp.watch(jsFiles, ['js']);
});

// Build, serve and watch for changes
gulp.task('preview', ['build'], function() {
	return gulp.start('serve', 'watch')
});