As this site grows, the "Users who liked this idea also liked" list on the more popular ideas could easily become unmanageable. As I understand it, the list displays all ideas voted for by all members who voted for the current idea. At the moment, the longest list (on "Better Brake Light") has only about 100 ideas. It's not out of the realm of possibility for this list to run into the thousands.
It might be better to limit the list to the top N ideas (e.g. 20), ranked by popularity. This could be done by looking at the number of votes cast by the pool of members who voted for the current idea.
For example, if "Better Brake Light" has 29 positive votes and 12 of those 29 also voted for "GPS and Digital Photos", then that idea gets 12 points for the list. Do this for every idea that the 29 members voted on and get the N ideas with the most points.
This would limit the list to a manageable number but would still give a good indication of the preferences of the members.
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Will do.
Done! Thanks for the suggestion.