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Picasa is a good program for beginners
Picasa 1.5.1 is a delightfully easy-to-use and inexpensive program that seems to have been developed for beginners who want to manage a limited set of digital photographs. Intermediate users and people with many photographs (that is the point of using an image manager, isn't it?) may quickly outgrow the program due to Picasa's limited metadata handling capabilities, which hurts the program in two ways.. 
[Picture metadata (data about pictures) are the stuff that allows one to preserve information such as the original date and time of a picture, as well as caption text (so one can recall everyone in a picture or the context of the picture, ten or twenty years later), inside the picture itself.]

Picasa is a good program for beginners, with potential to become a great program for everyone else in future releases.

The best RAW editor

Could you please tell me which is the best RAW editor (freeware or shareware). Is it ACR or RAWShooter or Capture One or some other? 
Thanks in advance. 

I started off using Digital Photo Professional which was supplied with the camera, it worked ok and I was happy with it. 

I'm now testing out Capture One, it seems to offer slightly more control but I don't think its a massive improvement over DPP. 

There really is no "best" just like there is no best camera. Try a few out (the non-free ones all have a free trial) and see which one YOU like best. 

I'll add Bibble to your list as I know many people who prefer it to C1, but i've not tried it myself yet.

2JPEG is a reliable batch graphics converter
2JPEG is a reliable batch graphics converter allowing you to convert images to jpeg format from 50 image file types. The program has no windows interface and processes multiple files at a time. With 2JPEG you can edit images before converting. 

Imagicon is a graphics utility
by Devious Codeworks Imagicon is a graphics utility designed to convert multiple image files from BMP, JPG, or PNG image formats into any of the following image formats (24-bit): BMP, JPEG, PNG, and ICO. Options are available to transform images and... More enable alpha transparency of icons. The interface window of Imagicon can be personalized with custom designs. The user can select to save icons with the following dimensions in pixels: 16 x 16, 32 x 32, 48 x 48, 64 x 64, and 128 x 128. Imagicon also features the ability to drag and drop multiple images for faster processing. Full instructions are included with the software, explaining each of the possible settings and the function that they perform. 

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