In Edmonton, those maps are conveniently available to share with prospective investors and new buyers. As a Realtor, I certainly have searches setup for my preferred areas along the existing & new expansion LRT lines. I search by neighborhoods though, not just within 800m of an LRT station.
Young families often prefer proximity to transit thinking about university access for themselves or their kids. In Edmonton, I'd argue that easy access to the UofA, Grant Macewan & Nait is more valuable than access to 'downtown' for jobs or entertainment. In my opinion, LRT access to downtown is most valuable to save on crazy parking fees, and the slow vehicle commute times to get in/out of downtown.
Access to the University, Royal Alex & soon the Grey Nuns hospital is also huge. They are massive employers, plus they serve Edmonton & much of northern AB. For non-Edmontonians, easy access to the hospitals is huge.
I certainly agree with Matt's comments about the best improvements in Edmonton being around the 75th & 66st corridors. There are alot of employers in that area - although all the workers are already fully accustomed to driving everywhere as transit access to the southeast sucks if you live in any other quadrant of the city.
For affordable homes in Edmonton, the northeast and southeast tend to offer the best value. Having LRT access has definitely improved the values (real or perceived) in much of Millwoods, especially the neighborhoods within walking distance of the new LRT stations. Contrarily, the northeast has had LRT access forever, and its still one of the most affordable areas.
The other investment value that comes with access to LRT stations is city support for investor activities like infill, re-zoning/re-development and increasing density. Its easier to get approval for a secondary suite, or tearing down a SF home to build a duplex/triplex when you are within walking distance of a main transit station. The parking requirements are reduced (residential & commercial) with proximity to public transit.