It would be nice to be able to see the future balances of asset and liability accounts based on the budget. Perhaps a line graph or bar graph that takes into account the actual balance of the account plus or minus the budgeted values for the future.

There is a bounty available for implementing this feature.
http://wiki.gnucash.org/wiki/Bounty_Program#Uservoice

As I mentioned on the Budget feature request, I have had excellent success using GNUCash as-is for zero-balance budgeting with virtual envelopes (similar to YNAB). Since that approach provides envelope balances at all times (budget versus actual), I believe the existing GNUCash report charts may already answer this request also.

Does not necessarily have to be MINT-like, just some quick and dirty plan vs. actual report would be nice. Later on a fancy budgetting capability would be very nice. But this should not prevent the qnd to be with us soon... :)

I am unsure how Mint.com does it but I have used Python to vizualize my portfolio, to find optimal variance points for portofolio -- and used it in tons of lab reports. Anyone knows whether someone is doing the wrapper already? I am new to GnuCash but I am interested if there is something to do with Python and some C.

To make it a bit more specific: I guess I am looking for a feature to plan budget and to graphically see where I am standing right now, what the trend is if I keep continuing spending as in the previous months. Also some sort of visual cue or alert to show whether things are going well or not. Sort of like a management cockpit.

As for just using Mint. There are quite some differences between your application and Mint. One is web-based, the other is a desktop application. One can only be used if you have a bank in the USA etc.

About the "Real working environment" comment: I agree, yes, that is totally off topic and should be moved to a new feature proposal or be deleted.

(There was an off-topic comment below, which I've just deleted.)