Handy links if you like to compare

VB.NET and C# Comparison

Java (J2SE 5.0) and C# Comparison

C# vs Ruby Smackdown!

log4net vs EL 1.0

SQL Server 2000 vs Oracle 9i

A Comparison of PL/SQL and Transact SQL

and last but not least:

Comparison of SOA Suites

Note there is an ESB implementation from P&P for BizTalk 2006 R2 that sort of leverage the missing functionality in the product: ESB Guidance for BizTalk Server 2006 R2

Ok, there’s nothing new here, just a personal cheat sheet :-p