Well, "recent" to me means anything from 2003 until now, given how much 90s anime I've seen, but I understand that most people mean the past year or two.
Hasn't been too much samurai series around recently:
Basilisk
Kurozuka (well...not really, but kind of)
Shigurui
Samurai Champloo
Bakumatsu Kikansetsu Irohanihoheto
These range from 2004 to currently airing.
As for Mecha:
Gundam 00
Macross Frontier
Code Geass
IdolMaster Xenoglossia
Gurren Lagann
Heroic Age
Soukou no Strain
These range from 2006 to currently airing.
It is interesting how much you lose when you only want to see recent series. While I have some really excellent titles in there, you really end up missing out.