Google's web search engine gives you one of the easiest and most complete ways to find anything on the web

Quickly view PDF documents and PowerPoint PPT presentation files in your browser without needing to install or start their application

Enter a question or calculation and Wolfram|Alpha uses its built-in algorithms and data to get the answer. A huge set of information and tons of models, methods, and algorithms that make it possible to compute whatever can be computed about anything

Get exchange rates and convert currency to and from 191 countries' currencies

Related:

1. Conversion
2. Convert
3. Finance
4. Money
5. Reference

Get detailed information about an Internet host. Enter an IP address (64.233.167.99), domain name (google.com), hostname (py-in-f99.google.com), or AS-number (AS15169) to get detailed dns information including reverse dns and forwards, whois information, who hosts the machine, and if it's listed in any RBLs (black lists).

Convert an IP address from 8/8/8/8-bit dotted-decimal format (dot-seperated, like 127.0.0.1) to 8/8/16-bit, 8/24-bit, and 32-bit notations in decimal, octal and hexadecimal.