Contrary to popular belief, web developers do sometimes leave their desks, and when they do, that’s always when clients seem to call or disaster seems to strike.

We’ve highlighted some iPhone apps here that will help you out in those situations, and a few others that will stash several neat tricks up your proverbial sleeve for when you’re away from the office.

Have a look, and if you’re an iPhone-owning web dev, let us know which apps you find useful for your work in the comments below.

1. Code Cheat Sheets

Concentric Sky offers a range of code “cheat sheets” ideal for when your mind just goes blank and you’re away from your usual reference material. Priced at $0.99 each, there are apps available for CSS, mySQL, JavaScript, php, RegEx, jQuery and HTML — the last three of which let you write and test code inside the app. Searchable, and clearly laid out, the info in the apps is available offline, unlike other options that link out to external references. Whether you want to brush up on the bus, or need to code on-the-go, these will be a useful weapon in your web design arsenal. Another great alternative is jQuery 1.4.

Cost: $0.99 each

2. Color Stream

A little bit like Adobe’s Kuler on your handset, Color Stream is an app that will help you narrow down the correct color, or palette of colors, for a project. The Lite version of the app is available for free, and lets you create a palette of five colors side-by-side using a slider bar in either RGB or CMYK modes. You can then identify your chosen shades by their hexadecimal values for use on the web. This is handy enough, but the paid-for option (priced at $2.99) offers even more functionality, such as the ability to save palettes, use the built-in color schemes, or even match colors perfectly by creating a palette based on elements from an image or photo.

Cost: Lite version is free, full version is $2.99

3. FTP on the Go

If you need to be able to securely log-in to a server away from your desk, then this app — which emulates desktop FTP clients on your mobile — might well be the answer. As well as offering the ability to edit text on the fly and make those changes live quickly, there’s the option to view common file types, download them to your iPhone, e-mail them, and upload videos and correctly-sized pics from your mobile device too. Meanwhile, cleverly getting around the iPhone’s multi-tasking issues, there’s a built-in web browser so you can see changes without leaving the app, allowing for speedy work — which as far as we know, no client has ever complained about.

If you don’t need access to your FTP server, don’t forget about Dropbox for the iPhone, which will let you view your Dropboxfolder while on the go.

Cost: $6.99

4. Ego

For an on-the-go, at-a-glance look at you site’s stats, either for your own consumption, or to keep a customer satisfied, Ego is a one-stop-shop for such data. This app does not go into extreme detail, but it will summarize data from Ember, Feedburner, Google Analytics, Mint (with an additional download), Squarespace,Twitter and Vimeo. Data such as how many Twitter followers an account has racked up, feed subscription totals, and visitor numbers are all at your fingertips in an easy-to-use app that saves you logging into to a plethora of individual services. The developer, Garrett Murray, says Ego offers a flexible framework for adding support for other services, and welcomes suggestions on adding other stat-tracking options.

Cost: $1.99

5. Read & Note

In addition to offering a full-screen browser (as opposed to the iPhone’s Safariwindow), this app allows you to make notes on, or copy and paste text from, web pages. Whether you’re browsing around for inspiration or assessing a site for changes/improvements, being able to easily annotate the web with a mobile app is simply brilliant. Other functionality includes the ability to upload .txt .doc .pdf .ppt .xls .rtf .jpg files, bookmark sites, and share uploaded documents over Wi-Fi to any web-enabled computer.

Cost: $1.99