Lets start with the essentials an then move on to the more funky ones..

PowerPoing Viewer and Converter 2007 : For office users using different versions might need viewers and converters from Microsoft. Click here to download Office converters and viewers.

Share PowerPoint Presentation Online: There are several sites which let users to upload their PowerPoint presentations and share them with their family and friends. Following are few such services..

• Slideshare.net
• Slideboom.com
• Authorstream.com

PowerPoint Search Engine: Brupt.com lets you search for all the PowerPoint presentations indexed by Google. In addition you can search for other office documents as well. Brupt.com

Insert WebPage in PowerPoint Presentations: LiveWeb is a free tool that lets you insert WebPages into a PowerPoint presentation.

Embed Youtube Videos in PowerPoint Presentation:  Download the Youtube Video Wizard plugin from skp.mvps.org which lets you embed Youtube videos into your presentation easily. Click here to download.

Convert PPT to PDF: There are several utilities which let you print any office document to PDF. These utilities can be used to convert PPT to PDF.
Following free utilities let you print to PDF..

• Cutepdf.com
• Primopdf.com

Convert PPT to Flash: iSpring Converter helps you convert your PowerPoint presentations to Flash (SWF) format. iSpring converter preserves the audio and all the animations including slide transitions while converting.

Download it from here.

Convert PPT to AVI, WMV, MPEG, MP3:  EffectMatrix offers to versions of its converter softwares. One which lets you convert PPT to limited video formats (AVI, WMV, MPEG) which is free and does not add any watermark to the video file and the paid version lets users convert PPT in almost all video formats, including for mobile phones, etc..

Click here to download the software.

Use iPhone as a PowerPoint Clicker:  i-Clickr PowerPoint Remote Lite is an iPhone application which converts your iPhone or iPod Touch into a visual clicker which lets you see the slides and control it from your iPhone.

Click here to download.

Create PowerPoint Presentations Online: Don’t have office installed on your computer; you’ve got nothing to worry about. There are quite a few online solutions available which let you create online presentations.

• Officelive.com
• Docs.google.com
• Show.zoho.com

Convert PowerPoint to ScreenSaver: Several tools allow users to convert PPT to Screensaver. Check out the following applications.

• Dgolds.com

I took a stab at it and downloaded the trial version to see how well it works; I tried to compress a 2.54MB PPT file using PPTshare.com product. Guess what! It did compress but the compression rate was 27% and came down to 1.91MB. I thought of using some existing compression software’s to compress this file. These software’s certainly cannot be compared to PPTshare.com compression software as the files are converted to .zip or .rar upon compression but what the heck they serve the purpose, don’t they?

I compressed the same file using default windows .zip compression, results were not very impressive then I used WinRar to compress this file and it did more than what PPTshare could do. File compressed with PPTShare software was sized down to 1.91MB and WinRar sized the file down to 1.90MB.

If you further want to compress the file then you can use both the software’s. First use PPTshare and then compress it with WinRar the final compression of 2.45MB file came down to 1.40MB.

The point is, if the intention is to compress the file so that it is easy to share then why not spend on something which is multi purpose and compresses virtually every single format that exists instead of something which compresses only one format.