Ok, so I'm having loads of trouble copy pasting previous posts, and now even the links from the MS Word document I saved! :-(

Anyway, here are the most important links I've found for the GMAT over a 1.5 month period:-

__PREPARATION (Theory)__- All free GMAT resources on Manhattan GMAT including Math theory notes and FLASHCARDS (Print AND online version!)
- Mental Math practice: GMAT Hacks (I think this is too basic for any Indian, esp one who's already studied for CAT before) and Gmatix
*(WOW! Killer site for improving calculation speed. A math calculation gym, literally!!!)* - Platinum GMAT's Math theory notes
*(pretty good website for basic understanding of math concepts, and their questions are pretty find for a basic level; not good enough review for geometry though)* - More Math concept building sites: Purple Math , Paul's Online Math Notes and Novapress GMAT Math
- Test Prep Preview - gives you questions on topic to help asses your weakness, and then directs you to resources to help build on that topic
- LearnHub's lessons on GMAT theory
*(their math lesson on geometry sucks, there's nothing there...good site for other stuff though)* - GMAT Grammar theory
- Worksheet for math formulas
**Very Basic Math Review***(with very basic diagnostic, and basic concepts and problems)***RicksMath's Geometry Review****Geometry formula practice sheet by saruba on GMATClub :)****GMAT Math book - a GMATClub Open Project***(I have gone through a couple of chapters, and it really is brilliant)***GMAT Grammar Book by the one and only GMATClub!**

__PREPARATION (Practice Questions)__- How to do practice problems: GMAT Hacks & MGMAT way
- GMAT Timer (I love this thing!)
- Weekly GMAT Question: MGMAT
*(these are good questions, claimed to be 700+ level;*& ScoreChase__a tip: save questions you found challenging with the answers, because they won't be available once the week has gone by!__) - GMAT Quant question of the day: GMAT Quant blog , TakeGMAT , GMATHacks
*(good questions)*,**GMATClub (NEW)** - Question Challenges from Kaplan
- GMAT Club's Math & Verbal tests (need to register to access them)
- GMAT Challenge Quiz collection at GMATClub
- WinningPrep's Free GMAT Verbal & Math test
- Grockit.com

**MISC**- 790 on GMAT post!
- 770 GMAT blogger
- GMAT Wings' 12 week study plan
**GMATClub's Math collection - this is for Math Prep: theory & questions!!!**- Beat The GMAT's 60-Day Study Plan

**FREE TESTS**- MGMAT free test
- Veritas Prep free test
- GMATClub's diagnostic test (go here to find GMATClub's list of all GMAT tests, including paid ones)
**Platinum GMAT's free prac test**

I'll keep adding more as and when I find them. I haven't gone through ALL of the above links in detail so I'll update this list with my comments as I go through it. Your own experiences/ratings/opinions are also welcome! :-)

Till then...

Continue believing!

Note: I will make the new additions to the list

**bold**so that you can keep a check on the latest updates. New comments on tested links will be made*italic.*

*UPDATE: 2015 is here, and I'm going to go through this list and update it soon. In the meantime, here's a mini (looks like it's going to be) useful set of links -*- this link on Beat The GMAT's Avengers Guide looks seriously useful. Must check it out.
- get BTG flashcards here.
- And of course, this resource list by BTG is amazing.
- gmat club's premium membership