This query returns different results under 7.1 and 7.2:

select a from
(select 'www.nytimes.com' as a
union
select 'www10.nytimes.com' as a
) as foo
order by 1

Under 7.1, the results are:

a
-------------------
www10.nytimes.com
www.nytimes.com
(2 rows)

While under 7.2, it's:

a
-------------------
www.nytimes.com
www10.nytimes.com
(2 rows)

It appears to have something to do with the lengths of the strings, because if you change the literals in the query above to 'www.' and 'www1', the sort order is the same under either version.