Can DNS Round Robin be fault tolerant?

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I am trying to use DNS round robin for load balancing multiple web
servers. I have read that there are some problems with this approach
however, specially related to fault tolerance and session maintenance.
By fault tolerance I mean if a web server is down, the DNS server has
no way of detecting this and will still send every nth request to the
dead server. Is there any way of making the DNS server more fault
tolerant, so that the it can detect the dead web servers and not send
any more requests there?

 I found a possible solution to the problem listed on this site here:
http://www.presttun.org/kare/DNS/DNS-LB-FT.pdf

Does anyone know about this paper and if so, are there any issues with
the solution listed here?

We would like to allow session maintenance. Does the DNS round robin
allow this and what are the possible ways to achieve this? Also, the
web servers are in different geographical locations. Are there any
problems with using the DNS round robin approach to load balance the
servers in different locations? 

Any help is appreciated.