It is advertised somewhere - in your post. ;)

You may also find More PM stats analysis on new levels, XP Graphs, Distribution of Levels and Writeups and quite a few more interesting. Many monks refer to tinymicros.com on their home nodes too.

I was wondering why this site isn't advertised more.

Probably because it's not really associated with PerlMonks. That site, or any application hosted on it, could change or go away at any time and there's nothing we PerlMonks could do about it. In fact just such a catastrophe already happened to perlmonk.org, another site similar to tinymicros.com. (It's back up, but it will never be the same.)

Update: Here is another example of what can happen to off-site resources, and why we might be reluctant to link to them here.

That being said, I have been roaming around the monastary for a while and had never even heard of this.

Indeed I also found it on a more or less random basis, not really in the CB, because I have it disabled. I actually don't even remember where, but probably I must have seen the XP chart in some other monk's homenode and wanted it for mine too. So I had to search for the very beast, and actually once you know that it exists, then it's not that hard to find...

I was wondering why this site isn't advertised more. Is there any reason in particular? If not, why isn't it on the main menu or at least a default on the side bar menu?

Because, as you notice, it's hosted at another place:

errol:~ [11:07:32]$ host perlmonks.org
perlmonks.org has address 209.197.123.153
perlmonks.org has address 66.39.54.27
perlmonks.org mail is handled by 10 mail.egl.net.
errol:~ [11:07:39]$ host tinymicros.com
tinymicros.com has address 65.6.151.62
tinymicros.com mail is handled by 10 tinymicros.com.
[download]

Indeed it's not really a feature of The Monastery, although it collects statistics about it: it's really a side project. Just as perlmonk.org, which I found by noticing that some authors occasionally referred to their homepage there, and indeed at first I didn't notice the missing "s", thus thinking it were a PM feature. (And I wanted one too.)

Perhaps, a permanent list of PM side projects would be fine. Currently I don't know if one exists, but if so, then it mustn't have too high a visibility. However periodic announcements are done, e.g. wrt perlmonk.org's "downage" and return to life.

Cheers,
Darren :)

In response to this, I have updated the list of PerlMonks-Related Resources on Other Servers, and re-linked it into the PerlMonks FAQ.

++ for him and the idea!

It's also advertised in jcwren's homenode.