After entering your serial number you are prompted with a warning about using a touchscreen while driving. I found the option to disable this a nice feature, often software leaves the user no choice due to liability concerns.
Once you click past the dialog you are greeted with a nice left side menu and top tab interface. After a few exploratory passes through all the options TouchScan has to offer (There are a lot!) I found it pretty easy to find what I was looking for in the menus. My TouchScan journey began in the Setup section where I was easily able to select my desired Com Port and Baud Rate. I had no problems connection to my generic ELM327 in my vehicle nor my ELM323 software emulator that I use for testing. I should note however that it was a little difficult to select the correct radio or check mark boxes in the setup section under the Connection or PID Monitor tabs with a touchscreen. It's nothing too serious since you will likely only visit these sections once. I had no problem hitting most of the other buttons in the interface with my finger. After successfully connection to my ELM I proceeded to look through the PID Monitor and PID Setup tabs where you are able to adjust a variety of options, including polling settings, dwell time to adjust update rates, as well as the polling rate for each individual PID. I found the individual polling rates to be an exceptionally nice feature that allowed me to retrieve the core values and well as secondary ones without sacrificing speed as much if I polled for all of them at the same interval.
The General tab allows you to adjust the unit system and switch between day and night mode, as well as adjust remembering preferences. While the Device Info tab lists the type of device you have connected.
Clicking the Diag Icon brings you to the set of tabs which allow you to read/clear trouble codes and monitor PID values as well as view the raw hex traffic between TouchScan and the ELM. I had no trouble codes to read so I was unable to test that feature but I found the PID Values to update relatively quickly, and do so at a rate in tune with the polling rate as things should be. Next up is the Dashboard section which is what is likely desired by most. MPG broken down by total, instant, and trip is displayed as wekk as fuel consumed and distance. In addition to the numeric displays are gauges representing RPM, Engine Load, Temp, and MPH. The possible dealbreaker for some is the fact that a MAF sensor readable through the standard PID is required in order to calculate MPG with TouchScan. Unfortunately, my Honda was not equipped with a MAF sensor so I had to test the MPG feature with a software emulator instead. Testing showed the calculated numbers to be consistent with those generated by Bruce Lightner's formula, MPG = 710.7 * VSS / MAF, so they should be pretty accurate. The last, but far from least section is Logs. Selecting the Logs icon presents you with the Plots, Plot Config, Data Logging, and Stats tabs. While the names are fairly self explanatory I found the plotting function to be nicely configurable with adjustable scales and sampling time and support for what appears to be as many plots as you have PIDS available. The Data Logging option is also a plus for analyzing data at a later time. And I found the Min, Max, and Mean shown under Stats to provide a nice snapshot of your overall trip.
In summary, if you have a MAF sensor in your vehicle that can be read via the standard PID I would definitely recommend you take a look at TouchScan. The Dashboard was easily visible on my 7" touchscreen and I see no problems embedding the app into RideRunner or any other frontend as everything is resizeable. If your vehicle lacks a MAF you need to determine how important MPG calculations are to you, as you will be unable to receive them with TouchScan.

DashCommand stems from its window's counterpart that has been long since in car computers. It offers a wireless connection to your OBD2 port to bring you a ton of engine diagnostic tools.

With DashCommand for iPhone you can see all your available PID's in multiple skins, follow your acceleration and braking, see your g-forces going around turns, read your car's angle while driving, and keep all of this data for a log.

The only downside to DashCommand is that you can't swipe between screens, and that you need to tell it to switch to landscape or portrait mode before the sensor graphics look correct. That is because you will be able to customize the dash boards in later version.

Some common techniques are:
Don't drive aggressively
Don't go over the speed limit
Avoid traffic
Avoid coming to a complete stop
Try to accelerate as slowly as possible
Using neutral when going down hills

Some uncommon techniques are"
Drafting behind trucks
Using centripetal force to go around turns fast
Over-inflating your tires to reduce friction

We took a look at how what kind of MPG we got out of our Toyota Matrix when doing basic hypermiling around town. We averaged 61 MPG when hypermiling and 27 MPG when driving normal. At some points on the trip going down hill in neutral we got up to 247 MPG.

If you have any of your own techniques or stories of your own hypermiling let's hear it.