Perl Contains the Lambda-Calculus - Explains why this computer program is well suited to apply to functional application. - http://perl.plover.com/lambda/
Lambda - An online introduction to the lambda calculus by Lloyd Allison, complete with a web form that will evaluate lambda expressions. - http://www.csse.monash.edu.au/~lloyd/tildeFP/Lambda/
Kolmogorov Complexity in Combinatory Logic - Online article by John Tromp. Kolmogorov complexity is a recursion theoretic characterisation of randomness. - http://www.cwi.nl/~tromp/cl/cl.html
Dual Identity Combinators - Article by Katalin Bimbó presented at the 20th World Congress of Philosophy. Investigates the addition of identity combinators, in the formulae-as-types sense, to combinatory logic. - http://www.bu.edu/wcp/Papers/Logi/LogiBimb.htm