One of the most asked questions about the iPhone is "how's the typing speed with iPhone's keyboard?" - how does it feel and how fast can you type with it.
So I had to do some typing testing. Here is a one test text below that I did using the Note application:
"this is a simple means of testing the typing speed with the apple iPhone. I'm now typing in horizontal position using two fingers. This seeks to work pretty well of you only can trust the way the whole system works. I will go back later to see how many mistrales I'm making while typing this test. Also u have not ore planned this text so it's much like I would be typing a blog or a email. We just have to see how well it's working. I have bow typed for tree minutes straight with two thumbs and I can say this is staring to feel pretty good. Also I would like to see and hear if you have done similar test yourself and what have been your results on re speed. Let Me know what your experiences are and how do you like the soft keyboard. Obcan already say that this dontbseem too bad. Now I have gone for five minutes and ibwill stop Hera. Next time I will use stop watcch for better accuracy."
In this text there is 176 words and it took about 4,5 minutes to write, making the typing speed about 39 WPM (words per minute). There is at least 9 typing errors in this text so the accuracy is about 95% and that's not too bad, since you can always go back and correct those with your computer later if you are writing a longer text (I don't suggest to make correction with your iPhone, unless the application you are using has a spell check build-in)
I also did some testing with this iPhone typing speed test tool online. On average I can get between 35 to 40 WPM with this test. The results are a bit better when the iPhone is in landscape mode.
No if I compare that to my typing speed with full size keyboard (about 53 WPM on average) it's not too bad, it's about 66% and if I compare that to my tests with the 7" eeePC (about 45 on average), it's about 80% of the speed on eeePC.
Naturally these are my test results and yours may vary, but I can imagine that percentages will be close to these results (or not).When typing with iPhone it's important to learn to trust the system and auto correction feature. If you try to type without errors, you will get slower results.
So are these results good or bad?
I think these are really good. I'm not the fastest typist anyway (I don't touch type), so if this brings me to about 65% of my normal speed while being mobile, to me that really good!
if you consider that when being mobile you actually don't normally type that much, in my usage typing is about or less than 5% of my overall mobile usage, then the slower typing speed really has no effect, considering I can type anywhere.
Also the errors in are not so critical, since I'm not planning to type lots of "highly important text" on the go, at least not long texts. If I'm typing short I can slow down and focus on correct spelling. If I'm typing long text, I will most likely edit it with computer anyway, so that's not a problem either.
If you are looking to read more about typing tests, here's' a google search for you and also check out some iPhone typing test videos from you tube as well.
Here's one of my favorites below.
One thing I have to keep reminding my friends and sometimes myself is that, iPhone is actually also a phone, so it really is with you all the time, for many other things than just talking ;).
Let me know your average speeds on your iPhone or iPod touch.

