I've been with Namecheap for most of my domains for a couple years now. One of the surprisingly awesome extras:

Dynamic DNS

No more need for DynDNS or another third-party DNS service for this simple but useful feature! Once enabled for a domain, you can simply use an update client to regularly update the IP Namecheap servers point to.

See Namecheap's knowledgebase articles to enable and use it: http://www.namecheap.com/support/knowledgebase/category.aspx...

Update clients:

ddclient (unixy) - http://sourceforge.net/apps/trac/ddclient

inadyn (unixy) - http://www.inatech.eu/inadyn/

Namecheap's DNS update client (Windows) - http://www.namecheap.com/support/knowledgebase/article.aspx/...