Here's my video workflow used in OGTV on the Original Green site. I use a very similar process in TA-TV on the Mouzon Design site. Your workflow may vary somewhat depending on the look and feel of the video you're creating.
I shoot on my iPhone because the quality of the iPhone 4 back camera is so good, and because I always have it on me.
Import clips to iPhoto 11 because that's the easiest way of getting them off the phone, deleting them once they're downloaded so they don't clog the phone (they can be massive.) I can see all my iPhoto videos from inside iMovie 11's Event Library, so getting them into iMovie is no problem. If you need to see them all in one place in iPhoto, here's an easy method.
Create a new project in iMovie's Project Library window by clicking the plus in the lower right corner. This will open the project's window in the upper left, where the Project Library window was a moment ago. Drag the clips you'll be using into the window. Normally, I have just one clip as I try really hard to say everything I want to say in one take.
Click on the T in the middle right of the window to bring up the Title Browser. Drag the Centered title (upper left) into the project's window, to the beginning of the project. Drag another Centered title to the end of the project. Each time you drag a title, it'll ask you for a Background. I first started to use Gradient, but use whatever makes the most sense with your videos. I now overlay the opening title on the first 3.5 seconds of the clip rather than on a gradient background. I do this because it's more interesting to scroll through the clips and actually see the starting image, rather than just seeing text. I suspect that text alone might cause some people to close the window, whereas text overlaid on the beginning of the clip may help induce them to click the Play button.
Double-click each title in turn, then double-clicking the text to select it. Then, change the font, color, and special features to what you're looking for. I use Futura Extra Bold, no outline, with the Original Green color. Change your titles. I use the title of the clip at the beginning, with the name of the participants (normally just me, sometimes Wanda as well) at the beginning, then www.originalgreen.org at the end.
Click on the Transitions tab, just right of the T (Titles) tab in the central right of the iMovie window. This will bring up all available transitions. I use Cross Dissolve. Drag a transition between the titles and each end of the clip(s.)
Because the final credit is only the website (which is quicker to read than the opening title) I select the last second of the final credits and delete it, leaving 2.5 seconds of final credits and the default 3.5 seconds of opening titles. They each come in at 4 seconds to begin with, but once you insert the transitions, it clips a half-second off each end.
Click the little gear in the lower left corner of the beginning of each clip and select Clip Adjustments. Under Video Effects, select Cartoon for OGTV videos and Hard Light for TA-TV videos. Cartoon has a dreamy look and saves video size because the soft focus means adjacent pixels are more similar. Hard Light is bigger, but necessary to clearly show construction details in TA-TV.