Okay kardotim,
Here's a couple of recent instances,
1. Submitted Nov. 21, 2012 at 11: 26
http://en.forums.wordpress.com/topic/why-are-gallery-image-captions-in-italics?replies=0
2. Submitted Nov. 21, 2012 at 11:36
http://en.forums.wordpress.com/topic/why-are-gallery-image-captions-displayed-in-italics?replies=0
My support request at the first of the above links:
The example image gallery at the gallery support page
http://en.support.wordpress.com/images/gallery/
shows titles or captions of the images in a neat, attractive font.
I've tried to duplicate this. Since neither the "alternative text" nor the "description" display text below the gallery images, the only option I've found to use "caption." But caption entries display as large and italicized text. It looks sloppy, particularly when the caption is longish, with a series of centered (by default, can't be modified) lines of text.
The second request is a slightly edited version of the first. I could hunt up some previous instances, from earlier this year, maybe last year too.