A couple options I can suggest:

Audacity, freeware for all kinds of audio editing, can handle this easily, but it'll be a pretty hands-on process.

iTunes has an option to join multiple tracks when importing songs, which of course would mean re-ripping the tracks in question.  Insert CD, select the multiple tracks to be combined, click Advanced on the menu bar, then "Join CD Tracks".  When you import, it'll create a single file for those tracks (in your format of choice).

Christopher

----- Original Message -----
From: Lawrence R Dunn 
Date: Thursday, May 7, 2009 9:11 am
Subject: Seek advice: stitching together multiple .mp3 files
To: audities@smoe.org

> Answer off-list if you like.
> 
> Long-time lurker, occasional blurter.
> 
> I recently finished uploading my CD collection to my spiffy new 
> HDD and have built me a big master playlist that I enjoy 
> shuffling all the live long day.
> 
> What I'd like to do is stitch together things that can certainly 
> be enjoyed separately but make a heck of a lot more sense 
> together -- for instance, the bulk of the old side 2 of Abbey 
> Road or "This Beat Goes On" and "Switchin' to Glide" by the Kings.
> 
> Are there apps out there for this? Or does the capability exist 
> in Windows Media Player or Creative Media Source and I'm looking 
> right at it?
> 
> Thanks for any pointers that can be offered. 
> 
>