I know this is an old thread, but just read it and felt compelled to reply.
I note the other people who replied were from Aberdeen, Middlesborough, S.E. and an undeclared location.
I actually live in Salford Quays.
Yes, there are a lot of new builds springing up and, yes, we have seen a softening of prices over the past few months, I'd say on the whole a market drop of about 5%.
Luckily, by 2010 the first phase of the MediaCity:UK development will be nearing completion and we'll start to see the influx of the relocated BBC staff, as well as staff for the other companies that have committed to MediaCity:UK (ITV, University of Salford etc).
By 2012, when MediaCity:UK is due to be completed, there will be a serious demand for property in Salford, notwithstanding that we might be looking at a cost of about £20 a day to travel into and out of Manchester/Salford by car due to the proposed road charging (dubbed toll tax) scheme.
While it's impossible to predict what rentals will be like in 2010, I would expect a good apartment, well managed, in a good location to get top money for the area.
Harbour City is in an excellent location for both the tram (Harbour City has it's own tram stop), MediaCity:UK and the Lowry. It's very easy and quick to the centre of Manchester on the tram (or by car).
A quick search on rightmove.co.uk shows there is lots of competition to rent at Harbour City, but rents are high (typically £800-£900+) for 2 and 3 bed apartments.
If you are still around, reply with the name of the actual development and I'll see what I can come back with.
Obviously, the advice above about doing due diligence before buying was good advice. My only question is, can you handle void periods and for how long?
Hope that helps (and your still around!)