I think IT provides 2 routes to business: increase revenue and decrease cost. The gap in the middle is named many things by finance experts but usually it helps to have a gap as wide as possible.
However, with putting in new IT no-one is going to pay you more or buy more and with putting in more IT costs aren't automatically coming down either. So IT as an enabler of something else then?
IT can help you define and measure what it is your sell best. And what you sell best is measured through receivables; what are customers paying for? what not? Start an initiative that measures exactly what is supposed to be done (according to your agreement with the customer, the specification or the service level agreement) and map that information against the invoiced amount: chances are they don't match... Then, what else is done? Can you stop doing anything that cannot be billed according to the agreement or start charging for it? Finally, when you've done it and delivered, do you send an accurate invoice (=according to what you've agreed) right away or is there a time-elapse between completion/delivery and invoicing (i've seen up to one year-wide gaps in my time) and guess what happens to your Days OutStanding (DOS)...
To earn the customer over to you and distinct from your competition, what is that you do -say for government reasons- that you need to do anyway that delivers information that could be of use to your customers. For you there's no or very limited added cost to produce this information and you're customer could actually see a lot of value in it and prefer you over competition.
Finally you could share your suppliers information. Say all is gloom and doom in your business and your suppliers knocks on your door to raise his prices... what's going on? is he out on a revenue hunt just like you or is there something else going on that can be passed on through the value chain? that's good news as your customers can soon start to raise their prices too (after you've done so of course).
IT can bring a lot to the table when it comes to revenue increases. The first few lines seem to say little but actually there's a lot of work in them. Think of the revenue pipeline from in the Order to Cash process; there's operations inthere somewhere; how do you capture activity that's linked to an order? how can you make sure all activity is adding value to that order? these are relevant questions which can only be answered through the right deployment of IT. Then the speed of invoicing is a clear IT issue; straightforward and relatively easy to implement. To be able to charge your customer with all adding value activities (or just stop these) you need a firm grip on your tracking mechanisms through IT.