This is my Ancestry wishlist from a point of view of ease of implementation, obviously Chromosome Browser is no. 1 on everyone's list but would require a lot of screen development, this list is more the things they could give us fairly easily.
1. Segment data download - simple download of zip file containing the matching segments between dna matches.
2. Triangulation - show which Shared Matches actually triangulate.
2b. Include triangulation segment data in 1.
3. Admit that outside of the USA the place name database is a total mess and start fixing it.
Adding Parish Names, Township Names and Registration District Names would be a good place to start.
4. More fully integrate the DNA and Tree data sets so that for example the normal (and quite good) search function could be filtered by dna matches.
This would allow more complex searches than just surname and location to be carried out on the trees of dna matches.
5. Add the ability to save the searches for future use.
6. Add logic functions to the filtering of dna matches. Give us AND, OR, NOT and brackets so that we just see the matches we want to. Admittedly this would be more work than the others but would be really useful.
The real improvement I'd like to see is stop treating everybody the same, make all the limits they hard code in be changeable so that they can be adjusted to suit our particular needs. Oh and stop making it so easy to add the wrong data to peoples trees, not sure how to do this though.