Nice article -- I like how you didn't just focus on topical analgesic gels, and how you branched out into skin care gels as well.
Many people in the skin care industry believe that gel really is the future thing as far as cleansing and treating acne goes, since it's just so much harder to clog pores with a gel than with a lotion.
You may have noticed that even more scrubs are becoming gel based, not to mention the peeling masks and dermatologist-prescribed acne gels.
It really is much better for oily skin than a lotion, since lotions are essentially oil and moisture themselves, and that's the last thing that oily or combination skin needs!
Gels also work well for those with large pores, since they can penetrate into the pores and clean them out without any trauma (like a Biore strip, for example) that would enlarge them.
You could do an entire article on gel in the beauty industry...I'll keep an eye out for it ;)