An update to progress of the development.

 It's not actually quite usable, with the main screen showing clickable links for accounts and budget review, also a summary of your budget based on income vs spending etc.  You can edit the transactions to assign a category or change a payee etc, you can create and edit a budget.  I've even put in an auto budget feature which will make a budget for you based on your category assignment to your spending, which you can then alter to the budget figures you want.

 here's a few screenshots of the changes, I've chucked some test data in there just to make it look a bit more useful.

 

 The Summary Section of the main page:

 
You can now setup when your financial period begins, You can also choose that this must end on same day each month, and it can take into account weekends, which as above shows that my next financial period begins on 20th March which is because the 21st falls on a saturday, and I always get paid on the weekday prior to that.
The other information on the summary is calculated based on what you have setup in your budget vs how much is in your account and the message will change depending on whether you are within budget or not and wether or not it thinks you will remain within your budget based on what you have setup. it will also tell you how much you are due to have left in the bank if your within your budget.
 
 
 
The Account List:
The account list now enables a hyper link when you hover over an account which you can click on to see details of transactions and also edit them to assign categories or choose to import a statement from your bank (CSV only still)
 
 
 
The Account Detail screen: 
on here you can see a list of the transactions and how they are affecting your running balance of the account, I'm planning on doing some nice colour coding for this screen, but keeping it just functional at the moment.
from here you can assign a category, which if you type in a non-existant category it will be added to the list for future use.
 
 
 
The Budget Review/Setup: 
Here is where you setup your budget for the period, I did a quick autobudget which has created a budget for me based on my spending and what category I assigned to each transaction for the last period.  you can edit any transaction by double clicking on it and changing it to something more rounded or add in a little buffer :)  
 
 
and that's it at the moment, you can add other accounts like credit cards and assign transactions to them.
 
The things i'm working on next are:
 
Transferring of funds (ie to pay a credit card/loan from a bank account).
Better editing of transactions.
Forecasting of account balance ( a nice chart of what your account may look like in the future) 
Some kind of Debt Repayment Planner.
Some nice Reports:
Income vs Spending
Monthly Spending Comparison
Spending by Payee
Spending by Category
 
 
That should keep me going for a little longer heh