Read Paul Fussell on socioeconomic class. (Kate Fox in her book Watching the English also has some interesting UK-specific commentary on class.) Some of the best stuff out there (that I know of).
Both of them focus on cultural and lifestyle differences, though -- just as a word of warning if that's not what you're looking for.
Gladwell in Outliers also has some interesting things to say on the influence of an upper class background on the skill to forge social connections, specifically in regards to comparing the respective achievements of Robert Oppenheimer (upper class) and Christopher Langan (very high IQ, but lower/middle class).
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.