Nice Link for web services which we can use for our line application .For example they have the currency converted web services which will have the running dollars rates so u will get the exact rate as of now

http://www.webservicex.net/WCF/default.aspx

They have different services like this just go and check

Mono .net only alternative for MS .net, Which runs on windows, Linux and Solaris and Mac OS ,Article tells more about more and its usage .Link.

It’s a Real Great News from Yahoo that it had announced to given access to the web services through SOAP .Here is the article link http://developer.yahoo.net/blog/archives/2007/03/mail.html

Decompiler are very useful when you don’t have your source and if you have only the assembly (dll).at this time we can decompiler and get the source .there are different decompiler available but most of them are too costly .in our .net framework itself we have decompiler Ildasm.exe but the output will be in MSIL, Hence we are going for third party decompiler. In that way reflector is very useful and freeware .few of the articles which I gone through are http://aspnet.4guysfromrolla.com/articles/080404-1.aspx