Tons of programs are being designed for the iPhone every day, and quite a few are making life easier for public speakers. In fact, the Top 10 most downloaded Business Apps (today, anyway, since this list may change tomorrow) includes four voice-recording programs.

Here are five iPhone apps you’ll probably find useful before your next public presentation:

Speakeasy Voice Recorder allows you to record and playback verbal notes and reminders from your iPhone’s built-in microphone. If you get a burst of inspiration for a future speech at an inconvenient time to write the speech, speak reminders into your phone.

This app sounds like the perfect program for anyone like Michael Keaton’s character in the 1982 comedy “Night Shift.” Keaton played a self-described “idea man,” who carried around a tape recorder so he could record his crackpot ideas, such as feeding mayonnaise to tuna-fish, or creating edible paper to eliminate garbage.

QuickVoice Recorder is another popular voice recorder for the iPhone, which includes a voice-to-text email feature.

Evernote allows you to capture information in a variety of environments using multiple devices or platforms (Mac, PC, etc.), and makes this information accessible and searchable at any time, from almost anywhere.

This program allows you to capture To-Do lists, notes and research, Web pages, twitter messages or snap photos of business cards/whiteboards/wine labels and more.

Remote Desktop, by MochaSoft, enables you to have secure access to your work computer through wifi or the phones network (EDGE). Using your iPhone, you can connect to your Windows work computer and see the files, programs, and resources exactly as you would if you were sitting at your desk… but of course, squinting on a far smaller screen.

Speech Timer: This program is designed with the Toastmaster Timer (or any longwinded public speaker) in mind. This timer app will make your iPhone vibrate or sound when the flag changes colors.

Editing images, photos or jpegs in Apple’s Keynote ’09 presentation software is an easy process, which no longer requires you to crop the photo or image in iPhoto. This is thanks to a new feature called “Mask.”

Simply place your photo on a Keynote slide, then click the Mask button, located slightly to the right of center in your browser. A square portion of your image will be zeroed in on, while the rest shades out. If you want to make the square portion smaller or bigger, you simply click on the edge of the image and drag it inward or outward until the mask is the size you want.

A mask slider will appear below the image, which allows you to zoom in or out on the image. If zooming in on the image moves the critical piece out of center, you can easily move the portion you want showing until it’s in the window.

Once you are done editing your photo, click “edit mask” again. The Mask portion of the image disappears, leaving you with a perfectly cropped image.

If you want to retouch your photo, there are several ways to do so. One is by doing it in iPhoto. For those who are willing to pay for a photo retouching software, Adobe Photoshop is considered the industry standard.

Another free alternative retouching tool is GIMP, which stands for GNU Image Manipulation Program, which is similar to the MS Paint program PC users may be familiar with.

Converting a PowerPoint presentation for a Mac so that you can take advantage of Apple’s sleek design and features of Keynote ’09 is easier than ever. All it takes is dragging and dropping the PowerPoint file onto the Keynote icon on your Mac desktop. The presentation file then opens in Keynote. (Keynote ’09, is an application that is part of iWork ’09, released last month.)

Conversely, if you’ve designed your slide deck in Keynote and will be one of a series of presenters (at a seminar, for example) who will all be using the same PC, no problem. It’s simple to convert your Keynote presentation into PowerPoint. The easiest of two ways to do this is by email. In the “Share” menu at the top of your Mac browser, select “Send via Mail,” then choose the format (Keynote, PowerPoint, or pdf). Keynote then launches the Mail program with the document already attached.

The second way is to go to the File menu in Keynote and select “Save As.” In the popup window that appears, check the box that says “Save Copy As,” then make sure “PowerPoint presentation” is selected. Then Click Save.