Dark's pretty much hit the major points. Two things that are semirelated, multicolumn lists are hard for us if you need to select a number based on the item, so an accessible mode which could make them single column is always nice. And, MUDS that show text tables. Ones that span 3 or 4 columns aren't so bad, but much more than that and we will have issues. Tables on websites or in spreadsheets, Word documents and the like are not problematic, because there is markup there which makes it a table, and the screen reader will see that markup, parse it and say oh, hey, we have a table here that's meant to be 5 columns and 13 rows. We then have table navigation commands that will move to any cell in the table, moving right or left through columns, or up and down through rows. Sometimes they will even read the header with the table data, so you don't have to remember, however, when a MUD sends a table, its just text visually formatted to look like a table. So, without that markup there, the screen reader has no way of knowing what it is, so it reads it like ordinary text, from left to right, top to bottom. Now, we can switch to a window and review the table without the text scrolling, but its still hard because you have to try to remember what the header is for each column while you're navigating the data. Also, since the screen reader doesn't know its a table, we have to navigate by word, because all that really does is skips to the next bit of text following a space or multiple spaces. OK, I like space / sci themed RP MUDs, so let's say we have a table that shows information related to an enemy, our headers are name, bearing, range, distance, and flags (containing information like class of ship, which shield is facing you, etc.). Now, one issue, since space is 3D, it takes two components to be able to move in three dimensions, the pitch of your craft, and its yaw, or side to side motion, rotating about the Z axis. Now, these two numbers are in the same category, so maybe you have hardcore fighter alpha 315 20 [1.25] scout class extra info
Now, try doing that while you're supposed to still be in the game, its not easy. The problem with why separating out the data from the rest when there is only one or two spaces is because word navigation doesn't care about how many spaces ther are between A and B, it just goes to the next non-space character, and reads the word, or in this case, numbers and other such symbols.
I'm a cat! What's mine is mine, and what's yours is mine to :P XD