Hey guy here are my recommendations:
~ a cab file is simple an install format file similar to using an exe on a computer, you put the file on your phone (either download straight to phone or move to phone while connected to PC). Save where you want for organization purposes (USE internal storage as our Diamonds don't have much "device" room so you want to keep it simple. You then use a file explorer and double click or highlight and then press your center/circle button to install.. install any/all programs to Internal Storage if it offers you a choice or unless specified explicitely
~ There are some useful programs to have to complete simple tasks of customizing and maintaining your phone. Most are free. You will also receive a lot of advice, some conflicting... each user has his/her own favorite "easy" way of doing something. In the beginning stick with what you're most comfortable with. Personally, I'd advise against flashing a new rom ... which is 99% of the recommendations to fix EVERYTHING.. but then new users end up with just as many issues/questions.. so first learn your phone and take your time (when you have it) reading and learning... THEN decide if you want to flash. Which according to many is the ultimate enhancement. I've not flashed nor unlocked and I"m extremely pleased with my phone. I'm not saying anything against flashing, only against making choices when someone is not fully understanding the system first.
Here are some programs I'd suggest to get you going. When I complete the theme I'm working on it will be in cab format so you'll just have to click to install.
Programs for phone:
1. total commander (file explorer, reg editor, copy/paste/move files even system files, unzip/zip files) free program:
http://ghisler.fileburst.com/ce/tcmdpocketarm.cab
2. Fingermenu... makes the diamond a bit more finger friendly with large, touchable, scrollable menus
http://handheld.softpedia.com/get/Sy...nu-71888.shtml
3. Fingerkeyboard... great customizable keybaord that is easy to use on Diamond with great support! Discussion:
http://forum.ppcgeeks.com/showthread...inger+keyboard recommended install giannis cab: (your device is VGA:
http://forum.ppcgeeks.com/attachment...3&d=1239201402)
4. Backup program.. costs but worth it! My choice is SPB Backup:
http://www.spbsoftwarehouse.com/pock...ftware/backup/
5. SKtools another program that costs but has tons of features for tweaking and maintaining phone including moving text and email and other temp type files to Internal Storage.. saves memory issues!
http://s-k-tools.com/index.html?sktools/m_feat.html
6. TF3DConfig... get the one that has the correct tweak file.. this program can be simple... you can move/rearrange your tabs as well as disable some. You can change "themes" if you end up going the route of using a ".theme" extension. And it has some simple tweaks.
http://forum.ppcgeeks.com/attachment...1&d=1243030704
7. Hibby's PPCgeeks app so you can read the forums on your phone while taking a break!
http://forum.ppcgeeks.com/showthread.php?t=69027
8.... I'm sure others will chime in with links to the battery saving tips and other reg edits... most of which should be cab type of files so you can simple click on them rather than poke your registry.