The "Teach Yourself" series is a good tutorial text for programmers that wish to learn the covered subject in a sequential, course-like manner.  Alternatively, the "Developer's Guide", "Mastering", or "Special Edition" series are excellent reference sources when more in-depth information is needed on a specific topic.  You may purchase these books by following the links to Amazon.com.

Delphi

Delphi 6 Developer's Guide (With CD-ROM): by Xavier Pacheco, et al.  Paperback - 1200 pages, 1st Edition (December 15, 2001), Sams, ISBN: 0672321157.

Mastering Delphi 6: by Marco Canu. Paperback - 1104 pages, Bk & CD-Rom Edition (July 25, 2001), Sybex, ISBN: 0782128742.

Delphi 5 Developer's Guide: by Steve Teixeira, Xavier Pacheco, and David Intersimone.  Paperback - 1200 pages Bk&Cd-Rom edition (December 27, 1999), Sams; ISBN: 0672317818.

Mastering Delphi 5: by Marco Cantu.  Paperback - 1104 pages, 3 edition (October 1999) Sybex; ISBN: 0782125654.

Teach Yourself Borland Delphi 4 in 21 Days: by Kent Reisdorph.  Paperback - 918 pages, 1 Ed edition (June 1998), Sams; ISBN: 0672312867.

Special Edition Using Delphi 3: by Todd Miller, David Powell, Roland Bouchereau, and Julia Bucknall.  Paperback - 1042 pages, Bk&Cd-Rom edition (April 1997), Que Education & Training; ISBN: 0789711184.

C++ Builder

C++ Builder 5 Developer's Guide: by Jarrod Hollingworth, Dan Butterfield (Editor), Bob Swart (Editor), and Jamie Allsop (Editor).  Paperback - 1300 pages Bk&Cd-Rom edition (October 2000), Sams; ISBN: 0672319721.

Teach Yourself Borland C++ Builder 4 in 24 Hours: by Kent Reisdorph and Brian Gill.  Paperback - 451 pages, Bk&Cd-Rom edition (April 9, 1999), Sams; ISBN: 0672316269.

Internet/Web

Special Edition Using Microsoft Front Page 2000: by Neil Randall and Dennis Jones.  Paperback - 1213 pages, Bk&Cd-Rom edition (January 5, 1999) MacMillan Publishing Company; ISBN: 078971910X.

Microsoft IIS 5 Administration: by Gerry O'Brian.  Paperback - 532 pages (September 2000) Sams; ISBN: 0672319640.

Teach Yourself Perl in 21 Days: by Laura Lemay.  Paperback - 720 pages, 3rd Edition, (March 23, 1999), Sams, ISBN: 0672313057.

Platinum Edition Using HTML 4, XML, and JavaScript 1.2: by Eric Ladd and Jim O'Donnell.  Hardcover - 1282 pages BK&Cd-Rom edition (December 1, 1998) MacMillan Publishing Company; ISBN: 078971759X.

Special Edition Using HTML 4, Sixth Edition: by Molly E. Holzschlag.  Paperback - 1109 pages, 6th BK&Cd-Rom edition (December 22, 1999) Que Education & Training; ISBN: 0789722674.

Operating Systems

Special Edition Using Microsoft (R) Windows XP Professional: by Robert Cowart, et al. Paperback - 1000 pages, Bk & CD-Rom Edition (December 4, 2001), Que Education & Training, ISBN: 0789726289.

Special Edition Using Micorsoft (R) Windows XP, Home Edition: by Robert Cowart, et al. Paperback - 1056 pages, Special Edition (October 10, 2001), Que Education & Training, ISBN: 0789726270.

Special Edition Using Microsoft Windows 2000 Server: by Robert Jennings.  Paperback - 1392 pages 1 edition (October 6, 2000) Que Education & Training; ISBN: 0789721228.

Special Edition Using Microsoft Windows 2000 Professional: by Bob Cowart and Brian Knittel.  Paperback - 1506 pages, Bk&Cd-Rom edition (March 2000), Que Education & Training; ISBN: 0789721252.

Special Edition: Using Windows 98: by Ed Bott and Ron Person.  Paperback - 947 pages, 2nd Bk&Cd-Rom edition (December 14, 1999), Que Education & Training; ISBN: 0789722038.