Politely asking "Why is this taking so long??"

I am trying to write a business email and, as English is not my first language, I'm having a bit of trouble coming up with a really polite way of saying the following:

Hi, It's been a week since I e-mailed you asking you for the documentation, and you haven't replied yet. I'm in a hurry, so, would you please send them to me as soon as possible?"

Here's what I've come up with so far:

I am looking forward to receiving these documents, as they are essential to our development. Would you please forward them as soon as possible?

But I feel that "Would you please forward them as soon as possible" is not polite enough. Is it? Are there any other options here?

Solution 1:

What you come up with is polite enough. Another option is something along the lines of,

I hope to move forward on this project next week. Please send the requested documentation by Friday; if that is not possible, please let me know when I can expect to receive the documentation.

It's a little more pointed but gives a deadline (useful) while acknowledging that their timescale may not be the same as yours (polite).