Some "good to know" RFCs (at least if you're an IT guy, like me)...
TEXT RFC 0791 - Internet Protocol
TEXT RFC 0792 - Internet Control Message Protocol
TEXT RFC 0793 - Transmission Control Protocol
TEXT RFC 0821 - Simple Mail Transfer Protocol
TEXT RFC 0850 - Standard for Interchange of USENET Messages
TEXT RFC 0894 - A Standard for the Transmission of IP Datagrams over Ethernet Networks
TEXT RFC 0959 - File Transfer Protocol (FTP)
TEXT RFC 0977 - Network News Transfer Protocol
TEXT RFC 1034 - Domain Names - Concepts and Facilities
TEXT RFC 1035 - Domain Names - Implementation and Specification
TEXT RFC 1036 - Standard for Interchange of USENET Messages
TEXT RFC 1149 - A Standard for the Transmission of IP Datagrams on Avian Carriers
TEXT RFC 1178 - Choosing a Name for Your Computer
TEXT RFC 1288 - The Finger User Information Protocol
TEXT RFC 1305 - Network Time Protocol (Version 3) Specification, Implementation and Analysis
TEXT RFC 1321 - The MD5 Message-Digest Algorithm
TEXT RFC 1323 - TCP Extensions for High Performance
TEXT RFC 1350 - The TFTP protocol (revision 2)
TEXT RFC 1436 - The Internet Gopher Protocol (a distributed document search and retrieval protocol)
TEXT RFC 1591 - Domain Name System Structure and Delegation
TEXT RFC 1731 - IMAP4 Authentication Mechanisms
TEXT RFC 1734 - POP3 AUTHentication command
TEXT RFC 1738 - Uniform Resource Locators (URL)
TEXT RFC 1918 - Address Allocation for Private Internets
TEXT RFC 1939 - Post Office Protocol - Version 3
TEXT RFC 1945 - Hypertext Transfer Protocol -- HTTP/1.0
TEXT RFC 1950 - ZLIB Compressed Data Format Specification version 3.3
TEXT RFC 1951 - DEFLATE Compressed Data Format Specification version 1.3
TEXT RFC 1952 - GZIP file format specification version 4.3
TEXT RFC 2045 - Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies
TEXT RFC 2046 - Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types
TEXT RFC 2047 - Multipurpose Internet Mail Extensions (MIME) Part Three: Message Header Extensions for Non-ASCII Text
TEXT RFC 2048 - Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures
TEXT RFC 2049 - Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples
TEXT RFC 2109 - HTTP State Management Mechanism
TEXT RFC 2195 - IMAP/POP AUTHorize Extension for Simple Challenge/Response
TEXT RFC 2385 - Protection of BGP Sessions via the TCP MD5 Signature Option
TEXT RFC 2396 - Uniform Resource Identifiers (URI): Generic Syntax
TEXT RFC 2401 - Security Architecture for the Internet Protocol
TEXT RFC 2428 - FTP Extensions for IPv6 and NATs
TEXT RFC 2449 - POP3 Extension Mechanism
TEXT RFC 2616 - Hypertext Transfer Protocol -- HTTP/1.1
TEXT RFC 2617 - HTTP Authentication: Basic and Digest Access Authentication
TEXT RFC 2817 - Upgrading to TLS Within HTTP/1.1
TEXT RFC 2818 - HTTP Over TLS
TEXT RFC 2980 - Common NNTP Extensions
TEXT RFC 3164 - The BSD syslog Protocol
TEXT RFC 3206 - The SYS and AUTH POP Response Codes
TEXT RFC 3330 - Special-Use IPv4 Addresses
TEXT RFC 3659 - Extensions to FTP
TEXT RFC 3977 - Network News Transfer Protocol (NNTP)
TEXT RFC 4217 - Securing FTP with TLS
TEXT RFC 4266 - The gopher URI Scheme
TEXT RFC 4271 - A Border Gateway Protocol 4 (BGP-4)
TEXT RFC 4642 - Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP)
TEXT RFC 4643 - Network News Transfer Protocol (NNTP) Extension for Authentication
TEXT RFC 4644 - Network News Transfer Protocol (NNTP) Extension for Streaming Feeds
TEXT RFC 4893 - BGP Support for Four-octet AS Number Space
TEXT RFC 5424 - The Syslog Protocol
DIR Other (non-RFC) technical documentation