I would suggest that link if it benfits the user / think as a user, does a link here will help? yes! Link it...Google will never mind.
I see no evidence that Google has any clue about a themed site, I see lots of evidence to say it doesn't.
A theme pyramid helps structuring content with focus both on users and SE's.
At some of my sites this works very well. Example with rankings:
www.companyname.com #1 for company
/general_keyword #7 for general kw
//less_general_keywords #2 for less general kws
///specific_keywords #1 for specific kws
Internal linking structure as BT recommended. Some inter-level linking shouldn'd harm but I would avoid heavy horizontal interlinking.
>I see no evidence that Google has any clue about a themed site, I see lots of evidence to say it doesn't.
Neither do I. However, in terms of designing for usability the idea makes some sense.
>I see no evidence that Google has any clue about a themed site, I see lots of evidence to say it doesn't...>
I don't either rfgdxm1 and I believe google guy even discounted that fact once...not that it hurts to theme obviously but....I firmly believe as many of us that anchor text is KEY...i know this for a fact. I also with all of my links put a short description with my keywords in it next to that anchor text b/c if google can give relevance to what's in anchor text who's to say they can't analyze some of the text around it. This theory has me in the top 5 for all of my keywords across the board with a number of sites. I don't think it matters where a link comes from as long as it can be seen as benefitting the user. I also only link to sites with a pr of 4 or better.
Just my take...
If you are going after themes for a site structure also keep in mind the modified theme structure. In such a structure you might think of bringing your most important competetive keyword to top level. The reason being People are more comfortable to link to home page. So you can target your anchor texts on that page for a competetive Keyword.
Again I am among one of those who finds the concept of themes logical for building sites. From google point of view not so sure. HTH :)
If it's just on one domain then I don't see any problem with heavy horizontal linking. If you're trying to establish a multi-domain theme pyramid then you should be very careful.
I agree that Google doesn't seem to have become a theme driven engine yet, and as Searg points out GoogleGuy doesn't seem a huge theming fan, but some engines do and it's the easiest SE friendly site architecture I know of.
Yes, it's just a single domain, and am relieved to hear that horizontal internal linking works just fine. I think I will use the "What's best for the user" trick. :)
Imaster, convincing people that ther principles of good old fashioned best practice Web design with plenty of content is an "SEO trick" is a large part of my job. :-)
If the subject matter is competitive, then probably you'll still need deep links from outside. Also, try to keep within 100 links per page and your 'enhanced pyramid' should do just fine.
Thanks everyone for all the suggestions. I really appreciate it. :)