If you're going to do any research into solving the traveling salesman problem (TSP), then you should know about these references. They are in Bibtex format, which is human-readable without too much work.
New 1998/5/30 I just found Mark Noschang's online survey paper about the TSP. It looks pretty good.
An excellent introduction to the TSP in general is the following:
@book { LawlerLRS1985,
    editor = {E.~L.~Lawler and J.~K.~Lenstra and A.~H.~G.~Rinnooy Kan
        and D.~B.~Shmoys},
    title = "The Traveling Salesman Problem",
    publisher = "John Wiley \& Sons Ltd.",
    year = 1985
}
 
The best results so far in solving TSPs exactly are in the following sources:
@unpublished{ ApplegateBixbyChvatalCook1994a,
    fullauthor = {David Applegate and Robert Bixby and Va\u{s}ek Chv\'{a}tal
        and William Cook},
    author = {D.~Applegate and R.~Bixby and V.~Chv\'{a}tal and W.~Cook},
    title = "Finding cuts in the {TSP} (a preliminary report)",
    month = "August",
    year = 1994,
    note = "Published electronically, at
        ftp://netlib.att.com/netlib/att/math/applegate/TSP/tsp\_aug23.ps.Z",
    email = "David Applegate is david@research.att.com"
}
 
@unpublished{ ApplegateBixbyChvatalCook1994b,
    fullauthor = {David Applegate and Robert Bixby and Va\u{s}ek Chv\'{a}tal
        and William Cook},
    author = {D.~Applegate and R.~Bixby and V.~Chv\'{a}tal and W.~Cook},
    month = "August",
    year = 1994,
    note = "Published electronically, at
        ftp://netlib.att.com/netlib/att/math/applegate/TSP/proofs",
    email = "David Applegate is david@research.att.com"
}
The best approximate solutions are found by the Lin-Kernighan heuristic, especially as implemented in Johnson et.al.'s work:
@article { LinKernighan1973,
    author = "S.~Lin and B.~W.~Kernighan",
    title = {An effective heuristic algorithm for the traveling salesman
        problem},
    journal = "Operations Research",
    volume = 21,
    year = 1973,
    pages = "498--516"
}
@inproceedings { Johnson1990,
    fullauthor = "David S.~Johnson",
    author = "D.~S.~Johnson",
    title = "Local optimization and the traveling salesman problem",
    booktitle = "ICALP '90",
    year = 1990,
    note ={Proceedings of the $17^{th}$ Colloquium on Automata, Languages, and
        Programming},
    publisher = "Springer-Verlag",
    pages  = "446-461"
}
 
@unpublished { JohnsonMcGeoch1995,
    fullauthor = "David S.~Johnson and Lyle A.~McGeoch",
    author = "D.~S.~Johnson and L.~A.~McGeoch",
    title = {The {Traveling} {Salesman} {Problem}:
            {A} {Case} {Study} in {Local} {Optimization}},
    year = 1995,
    note = {Draft of November 20, 1995.  To appear as a chapter in the book
        {\sl Local Search in Combinatorial Optimization}, E.~H.~L.~Aarts
        and J.~K.~Lenstra (eds.), John Wiley and Sons, New York.}
}
This last reference can temporarily be found at:
ftp://dimacs.rutgers.edu/pub/dsj/temp/chap.ps.Z
The Lin-Kernighan heuristic is suitable for any symmetric TSP.
For a comparison of approximate TSP algorithms on some standard data, see Reinelt's work:
@article { Reinelt1991,
	fullauthor = "Gerhard Reinelt",
	author = "G.~Reinelt",
	title = "{TSPLIB} --- A Traveling Salesman Problem Library",
	journal = "ORSA Journal on Computing",
	year = 1991,
	volume = 3,
	number = 4,
	pages = "376--384"
}
@book { Reinelt1994,
	fullauthor = "Gerhard Reinelt",
	author = "G.~Reinelt",
	title = {The traveling salesman: Computational solutions for {TSP}
		applications},
	publisher = "Springer {V}erlag",
	year = 1994,
	isbn = "0-387-58334-3",
	note = "LNCS 840"
}
Ton Volgenant has published a Pascal program for exactly solving Euclidean TSPs of up to about 200 cities.
@article { Volgenant1990,
	fullauthor = "Ton~Volgenant",
	author = "T.~Volgenant",
	title = "Symmetric {TSP}s ({ORSEP} program)",
	journal = "European Journal of Operational Research",
	year = 1990,
	volume = 49,
	pages = "153--154",
	smail = {Operations research group, 
		Department of Actuarial Sciences and Econometrics,
		Roetersstraat 11, 1018 WB Amsterdam,
		The Netherlands,
		tel 020 5254219 (4217)}
}
You should also know about the TSPLIB home page.